Updated Docker to use local ESV copy instead of external mdbible clone

- **ESV data source**: Switched from external mdbible GitHub repo to local ESV directory
- **Removed git clone**: No longer cloning from https://github.com/lguenth/mdbible.git
- **Local ESV copy**: Now COPY ESV /app/bible-data instead of external pull
- **Removed git dependency**: Cleaned up unnecessary git install in Dockerfile
- **Updated comments**: Backend now correctly marked ESV as 'local files'

Both ESV and NKJV now served from local repository files in Docker container!

backend/src/index.js

@@ -36,7 +36,7 @@ app.use(express.static(path.join(__dirname, '../../frontend/build')));
 app.use('/logos', express.static(path.join(__dirname, '../../frontend/logos')));
 
 // Bible data directories
-const ESV_DATA_DIR = path.join(__dirname, '../../bible-data'); // ESV from mdbible
+const ESV_DATA_DIR = path.join(__dirname, '../../bible-data'); // ESV local files
 const NKJV_DATA_DIR = path.join(__dirname, '../../NKJV'); // NKJV local files
 
 // Initialize search engines for each version