make index files into an implementation detail

nginx/nginx.conf

@@ -137,10 +137,6 @@ http {
             return 301 $1/$2;
         }
 
-        if ($request_uri ~ ^(.*)/index$) {
-            return 301 $1/;
-        }
-
         # https://www.twipu.com/GrapheneOS doesn't handle links with fragments properly
         if ($request_uri ~ "^/(.*)%3Ca%20href=$") {
             return 301 /$1;
@@ -289,7 +285,7 @@ http {
             add_header Cache-Control "public, max-age=1800";
         }
 
-        location ~ "\.(br|gz|html)$" {
+        location ~ "(/index|\.(br|gz|html))$" {
             internal;
         }