Avoid trying to optimise static serving of the calculator app, since the nginx configuration doesn't read symlinks anyway.

app-config/nginx/calculator-static

@@ -1 +0,0 @@
-../../cara/apps/calculator/static

app-config/nginx/nginx.conf

@@ -61,11 +61,6 @@ http {
         }
         rewrite ^/expert-app$ /voila-server/voila/render/cara.ipynb last;
 
-        # Give the static content of the calculator app a sensible name which is
-        # consistent with the static directory of the calculator webserver used
-        # for development.
-        rewrite ^/calculator/static/(.*)$ /calculator-static/$1 last;
-
         # Before implementing the nginx router we could access /voila/render/cara.ipynb.
         # Redirect this (and all other) URLs to the new scheme.
         absolute_redirect off;