## Major CodePress CMS Enhancement

### 🚀 New Features
- **League CommonMark Integration**: Replaced basic Markdown parser with full CommonMark 2.7 support
- **Bootstrap Sass Architecture**: Modern SCSS build system with Bootstrap 5.3.8
- **Enhanced Navigation**: Uses filenames instead of H1 titles for consistency
- **Improved Styling**: Transparent navigation backgrounds, no rounded corners

### 🎨 UI/UX Improvements
- Navigation items now use formatted filenames (e.g., "kennis-boven-aantallen" → "Kennis Boven Aantallen")
- Transparent navigation backgrounds with subtle hover effects
- Removed rounded corners from first-level navigation
- 50% opacity navigation background using Bootstrap variables

### 🔧 Technical Improvements
- **Class Organization**: Extracted CodePressCMS and SimpleTemplate to separate files
- **Full PHPDoc Documentation**: Complete documentation for all methods
- **Modern Build Process**: npm scripts for SCSS compilation
- **Enhanced Markdown Support**: Tables, strikethrough, task lists, autolinks
- **Security**: Proper HTML sanitization with CommonMark

### 📦 Dependencies
- Added `league/commonmark` for professional Markdown parsing
- Added `bootstrap` for SCSS-based styling
- Updated `sass` build process

### 🐛 Bug Fixes
- Fixed content directory path configuration
- Resolved navigation title inconsistencies
- Improved Markdown bold/italic formatting
- Fixed homepage 404 issues

### 🔄 Migration Notes
- Content directory moved from `content/` to `public/content/`
- Navigation now displays filenames instead of content H1 titles
- CSS now compiled from SCSS source files

The CMS now provides a professional, modern experience with robust Markdown support and clean, maintainable code architecture.

vendor/league/commonmark/src/Normalizer/SlugNormalizer.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Normalizer;
+
+use League\Config\ConfigurationAwareInterface;
+use League\Config\ConfigurationInterface;
+
+/**
+ * Creates URL-friendly strings based on the given string input
+ */
+final class SlugNormalizer implements TextNormalizerInterface, ConfigurationAwareInterface
+{
+    /** @psalm-allow-private-mutation */
+    private int $defaultMaxLength = 255;
+
+    public function setConfiguration(ConfigurationInterface $configuration): void
+    {
+        $this->defaultMaxLength = $configuration->get('slug_normalizer/max_length');
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @psalm-immutable
+     */
+    public function normalize(string $text, array $context = []): string
+    {
+        // Add any requested prefix
+        $slug = ($context['prefix'] ?? '') . $text;
+        // Trim whitespace
+        $slug = \trim($slug);
+        // Convert to lowercase
+        $slug = \mb_strtolower($slug, 'UTF-8');
+        // Try replacing whitespace with a dash
+        $slug = \preg_replace('/\s+/u', '-', $slug) ?? $slug;
+        // Try removing characters other than letters, numbers, and marks.
+        $slug = \preg_replace('/[^\p{L}\p{Nd}\p{Nl}\p{M}-]+/u', '', $slug) ?? $slug;
+        // Trim to requested length if given
+        if ($length = $context['length'] ?? $this->defaultMaxLength) {
+            $slug = \mb_substr($slug, 0, $length, 'UTF-8');
+        }
+
+        // @phpstan-ignore-next-line Because it thinks mb_substr() returns false on PHP 7.4
+        return $slug;
+    }
+}

vendor/league/commonmark/src/Normalizer/TextNormalizer.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\CommonMark\Normalizer;
+
+/***
+ * Normalize text input using the steps given by the CommonMark spec to normalize labels
+ *
+ * @see https://spec.commonmark.org/0.29/#matches
+ *
+ * @psalm-immutable
+ */
+final class TextNormalizer implements TextNormalizerInterface
+{
+    /**
+     * {@inheritDoc}
+     *
+     * @psalm-pure
+     */
+    public function normalize(string $text, array $context = []): string
+    {
+        // Collapse internal whitespace to single space and remove
+        // leading/trailing whitespace
+        $text = \preg_replace('/[ \t\r\n]+/', ' ', \trim($text));
+        \assert(\is_string($text));
+
+        // Is it strictly ASCII? If so, we can use strtolower() instead (faster)
+        if (\mb_check_encoding($text, 'ASCII')) {
+            return \strtolower($text);
+        }
+
+        return \mb_convert_case($text, \MB_CASE_FOLD, 'UTF-8');
+    }
+}

vendor/league/commonmark/src/Normalizer/TextNormalizerInterface.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Normalizer;
+
+/**
+ * Creates a normalized version of the given input text
+ */
+interface TextNormalizerInterface
+{
+    /**
+     * @param string               $text    The text to normalize
+     * @param array<string, mixed> $context Additional context about the text being normalized (optional)
+     *
+     * $context may include (but is not required to include) the following:
+     *   - `prefix` - A string prefix to prepend to each normalized result
+     *   - `length` - The requested maximum length
+     *   - `node` - The node we're normalizing text for
+     *
+     * Implementations do not have to use or respect any information within that $context
+     */
+    public function normalize(string $text, array $context = []): string;
+}

vendor/league/commonmark/src/Normalizer/UniqueSlugNormalizer.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Normalizer;
+
+// phpcs:disable Squiz.Strings.DoubleQuoteUsage.ContainsVar
+final class UniqueSlugNormalizer implements UniqueSlugNormalizerInterface
+{
+    private TextNormalizerInterface $innerNormalizer;
+    /** @var array<string, bool> */
+    private array $alreadyUsed = [];
+
+    public function __construct(TextNormalizerInterface $innerNormalizer)
+    {
+        $this->innerNormalizer = $innerNormalizer;
+    }
+
+    public function clearHistory(): void
+    {
+        $this->alreadyUsed = [];
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @psalm-allow-private-mutation
+     */
+    public function normalize(string $text, array $context = []): string
+    {
+        $normalized = $this->innerNormalizer->normalize($text, $context);
+
+        // If it's not unique, add an incremental number to the end until we get a unique version
+        if (\array_key_exists($normalized, $this->alreadyUsed)) {
+            $suffix = 0;
+            do {
+                ++$suffix;
+            } while (\array_key_exists("$normalized-$suffix", $this->alreadyUsed));
+
+            $normalized = "$normalized-$suffix";
+        }
+
+        $this->alreadyUsed[$normalized] = true;
+
+        return $normalized;
+    }
+}

vendor/league/commonmark/src/Normalizer/UniqueSlugNormalizerInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Normalizer;
+
+interface UniqueSlugNormalizerInterface extends TextNormalizerInterface
+{
+    public const DISABLED        = false;
+    public const PER_ENVIRONMENT = 'environment';
+    public const PER_DOCUMENT    = 'document';
+
+    /**
+     * Called by the Environment whenever the configured scope changes
+     *
+     * Currently, this will only be called PER_DOCUMENT.
+     */
+    public function clearHistory(): void;
+}