🚚(frontend) rename "wellknown" directory to "well-known"

Fix a typo introduced while configuring the correct directory for
automatic container view opening on Windows.

src/frontend/default.conf

@@ -5,9 +5,9 @@ server {
 
   root /usr/share/nginx/html;
 
-  location = /.wellknown/windows-app-web-link {
+  location = /.well-known/windows-app-web-link {
       default_type application/json;
-      alias /usr/share/nginx/html/.wellknown/windows-app-web-link;
+      alias /usr/share/nginx/html/.well-known/windows-app-web-link;
       add_header Content-Disposition "attachment; filename=windows-app-web-link";
   }