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

vite.config.ts

@@ -4,6 +4,7 @@ import { nodePolyfills } from 'vite-plugin-node-polyfills';
 import { resolve } from 'path';
 
 export default defineConfig(({ mode }) => ({
+  base: process.env.BASE_URL || '/',
   plugins: [
     tailwindcss(),
     nodePolyfills({