## 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/Input/MarkdownInput.php

@@ -0,0 +1,102 @@
+<?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\Input;
+
+use League\CommonMark\Exception\UnexpectedEncodingException;
+
+class MarkdownInput implements MarkdownInputInterface
+{
+    /**
+     * @var array<int, string>|null
+     *
+     * @psalm-readonly-allow-private-mutation
+     */
+    private ?array $lines = null;
+
+    /** @psalm-readonly-allow-private-mutation */
+    private string $content;
+
+    /** @psalm-readonly-allow-private-mutation */
+    private ?int $lineCount = null;
+
+    /** @psalm-readonly */
+    private int $lineOffset;
+
+    public function __construct(string $content, int $lineOffset = 0)
+    {
+        if (! \mb_check_encoding($content, 'UTF-8')) {
+            throw new UnexpectedEncodingException('Unexpected encoding - UTF-8 or ASCII was expected');
+        }
+
+        // Strip any leading UTF-8 BOM
+        if (\substr($content, 0, 3) === "\xEF\xBB\xBF") {
+            $content = \substr($content, 3);
+        }
+
+        $this->content    = $content;
+        $this->lineOffset = $lineOffset;
+    }
+
+    public function getContent(): string
+    {
+        return $this->content;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getLines(): iterable
+    {
+        $this->splitLinesIfNeeded();
+
+        \assert($this->lines !== null);
+
+        /** @psalm-suppress PossiblyNullIterator */
+        foreach ($this->lines as $i => $line) {
+            yield $this->lineOffset + $i + 1 => $line;
+        }
+    }
+
+    public function getLineCount(): int
+    {
+        $this->splitLinesIfNeeded();
+
+        \assert($this->lineCount !== null);
+
+        return $this->lineCount;
+    }
+
+    private function splitLinesIfNeeded(): void
+    {
+        if ($this->lines !== null) {
+            return;
+        }
+
+        $lines = \preg_split('/\r\n|\n|\r/', $this->content);
+        if ($lines === false) {
+            throw new UnexpectedEncodingException('Failed to split Markdown content by line');
+        }
+
+        $this->lines = $lines;
+
+        // Remove any newline which appears at the very end of the string.
+        // We've already split the document by newlines, so we can simply drop
+        // any empty element which appears on the end.
+        if (\end($this->lines) === '') {
+            \array_pop($this->lines);
+        }
+
+        $this->lineCount = \count($this->lines);
+    }
+}

vendor/league/commonmark/src/Input/MarkdownInputInterface.php

@@ -0,0 +1,26 @@
+<?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\Input;
+
+interface MarkdownInputInterface
+{
+    public function getContent(): string;
+
+    /**
+     * @return iterable<int, string>
+     */
+    public function getLines(): iterable;
+
+    public function getLineCount(): int;
+}