feat: Add VitePress docs, EPUB to PDF tool, Phosphor icons, and licensing updates

- Set up VitePress documentation site (docs:dev, docs:build, docs:preview)
- Added Getting Started, Tools Reference, Contributing, and Commercial License pages
- Created self-hosting guides for Docker, Vercel, Netlify, Cloudflare, AWS, Hostinger, Nginx, Apache
- Updated README with documentation link, sponsors section, and docs contribution guide

- Added EPUB to PDF converter using LibreOffice WASM

- Migrated to Phosphor Icons for consistent iconography

- Added donation ribbon banner on landing page
- Removed 'Like My Work?' section (replaced by ribbon)
- Updated licensing.html with delivery model, AGPL notice, invoicing, and no-refund policy

- Added Commercial License documentation page
- Updated translations table (Chinese added, marked non-English as In Progress)

- Added sponsors.yml workflow for auto-generating sponsor avatars

src/pages/extract-pages.html

@@ -29,8 +29,8 @@
 
                 <div class="hidden md:flex items-center space-x-8 text-white">
                     <a href="/" class="nav-link" data-i18n="nav.home">Home</a>
-                    <a href="./about.html" class="nav-link">About</a>
-                    <a href="./contact.html" class="nav-link">Contact</a>
+                    <a href="/about.html" class="nav-link">About</a>
+                    <a href="/contact.html" class="nav-link">Contact</a>
                     <a href="/" class="nav-link" data-i18n="nav.allTools">All Tools</a>
                 </div>
 
@@ -57,8 +57,8 @@
         <div id="mobile-menu" class="hidden md:hidden bg-gray-800 border-t border-gray-700">
             <div class="px-2 pt-2 pb-3 space-y-1 text-center">
                 <a href="/" class="mobile-nav-link" data-i18n="nav.home">Home</a>
-                <a href="./about.html" class="mobile-nav-link">About</a>
-                <a href="./contact.html" class="mobile-nav-link">Contact</a>
+                <a href="/about.html" class="mobile-nav-link">About</a>
+                <a href="/contact.html" class="mobile-nav-link">Contact</a>
                 <a href="/" class="mobile-nav-link" data-i18n="nav.allTools">All Tools</a>
             </div>
         </div>