docs: update APPLY_TO_MAIN_SITE.md with detailed deployment checklist

Enhanced the APPLY_TO_MAIN_SITE.md by providing a comprehensive checklist for production deployment, ensuring all necessary steps are clearly outlined. This update improves the deployment process for developers and aligns with the project's operational standards.

Author: asperpharma

.gitignore

@@ -11,6 +11,7 @@ node_modules
 dist
 dist-ssr
 *.local
+.env
 
 # Editor directories and files
 .vscode/*