feat: Add subdirectory hosting support and fix asset path resolution

- Update README with comprehensive subdirectory hosting instructions and BASE_URL configuration guide
- Convert absolute asset paths to relative paths in index.html for proper subdirectory deployment
- Update all worker script imports to use relative paths instead of absolute paths
- Fix favicon and image references to work correctly when hosted in nested directories
- Normalize whitespace and formatting across worker files for consistency
- Update vite.config.ts to properly handle BASE_URL configuration for subdirectory deployments
- Ensure all tool pages and logic files maintain compatibility with subdirectory hosting
- Enable BentoPDF to be deployed at any URL path (e.g., example.com/tools/bentopdf/) without breaking asset loading

src/js/logic/form-creator.ts

@@ -1962,7 +1962,7 @@ downloadBtn.addEventListener('click', async () => {
 const backToToolsBtns = document.querySelectorAll('[id^="back-to-tools"]') as NodeListOf<HTMLButtonElement>
 backToToolsBtns.forEach(btn => {
     btn.addEventListener('click', () => {
-        window.location.href = '/'
+        window.location.href = import.meta.env.BASE_URL
     })
 })