fix: make CSP generic for OSS — remove visitran.com-specific domains

Author: wicky-zipstack

frontend/nginx.conf

@@ -54,7 +54,7 @@ http {
         add_header X-Frame-Options "DENY" always;
         add_header X-Content-Type-Options "nosniff" always;
         add_header Referrer-Policy "strict-origin-when-cross-origin" always;
-        add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https://*.visitran.com wss://*.visitran.com; object-src 'none'; base-uri 'self'; frame-ancestors 'none';" always;
+        add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' wss: ws:; object-src 'none'; base-uri 'self'; frame-ancestors 'none';" always;
 
         # If a react app URI is directly accessed we will get 404
         # since there will be no file representing that path.