Options -Indexes +SymLinksIfOwnerMatch
DirectoryIndex index.php index.html
RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_URI} !^/production/

# Don't apply to URLs that go to existing files or folders
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# Rewrite all those to insert /production folder
RewriteRule ^(.*)$ /production/$1 [L]