UPDATE/REFACTOR: Rework of UserPage;

FIX: Fallback for profile pictures;
REFACTOR: Removal of unnecessary files & routes;
REFACTOR: Improve documentation for flask routes;
FIX: Correct data to return when fetching vods;

nginx/nginx.conf

@@ -104,7 +104,7 @@ http {
         }
 
         ## Profile pictures location
-        location ~ ^/user/(.+)/index.png$ {
+        location ~ ^/user/(.+)/profile_picture$ {
             alias /user_data/$1/index.png;
             # where $1 is the user's username