🐛(nginx) fix 404 when accessing a doc

We improve the nginx way to access to a specific
doc.
We stop to wait for a initial attempt that
give a 404. If we see a UUID in the url we will
redirect to the doc/[id] page. Next will then
manage the 404.

src/frontend/apps/impress/conf/default.conf

@@ -9,8 +9,8 @@ server {
       try_files $uri index.html $uri/ =404;
   }
 
-  location /docs/ {
-    error_page 404 /docs/[id]/;
+  location ~ "^/docs/[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/?$" {
+      try_files $uri /docs/[id]/index.html;
   }
 
   error_page 404 /404.html;