chore: remove experimental caching

Author: adrianschubek

docs/docs/advanced/caching.md

@@ -13,15 +13,6 @@ http {
 
     access_log off;
 
-    $[if `process.env.EXPERIMENTAL_CACHE`]$
-    fastcgi_cache_key localhost:9000$request_uri;
-    fastcgi_cache_path /data/nginx/cache keys_zone=cache:10m inactive=1d max_size=1G loader_threshold=300 loader_files=200;
-    fastcgi_cache_min_uses 1;
-    fastcgi_cache_valid 200 302 10m;
-    fastcgi_cache_valid 301 1h;
-    fastcgi_cache_valid any 1m;
-    $[end]$
-
     # Hardening
     proxy_hide_header X-Powered-By;
     fastcgi_hide_header X-Powered-By;