Fixed nginx config to pass .well-known to Ghost by default (#1971)

We were passing anything matching /.well-known to Nginx, causing 404s
for /ghost/.well-known/jwks.json and /.well-known/recommendations.json

I believe the only use for this was /.well-known/acme-challenge, so I've
increased the specificity and only left this block in-tact for the
HTTP(80) config file.

Author: sam-lord

extensions/nginx/templates/nginx-ssl.conf

@@ -44,9 +44,5 @@ server {
         add_header X-Content-Type-Options $header_content_type_options;
     }
 
-    location ~ /.well-known {
-        allow all;
-    }
-
     client_max_body_size 1g;
 }

extensions/nginx/templates/nginx.conf

@@ -40,7 +40,7 @@ server {
         add_header X-Content-Type-Options $header_content_type_options;
     }
 
-    location ~ /.well-known {
+    location ~ ^/.well-known/acme-challenge {
         allow all;
     }