Refactor: Replace sidebar with horizontal navigation bar

- Remove sidebar and toggle functionality
- Add Bootstrap navbar with dropdown menus
- Move navigation to top between header and content
- Update menu rendering for Bootstrap dropdowns
- Clean up unused files (header.mustache, sidebar.mustache, sidebar.js)
- Add guide link with book icon in footer
- Simplify layout structure
- Remove duplicate code and fix syntax errors
- Add .gitignore for node_modules and other temp files

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "codepress",
+  "version": "1.0.0",
+  "description": "A lightweight, file-based Content Management System built with PHP and Bootstrap.",
+  "main": "index.js",
+  "scripts": {
+    "build:css": "npx sass engine/assets/css/style.scss public/assets/css/style.css --no-source-map",
+    "watch:css": "npx sass engine/assets/css/style.scss public/assets/css/style.css --no-source-map --watch",
+    "build": "npm run build:css",
+    "clean": "rm -rf node_modules package-lock.json",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://git.noorlander.info/E.Noorlander/CodePress.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "sass": "^1.94.2"
+  }
+}