Fix root path in nginx config of h5ai: h5ai working

Dockerfiles/h5ai/h5ai.nginx.conf

@@ -1,6 +1,6 @@
 server {
   listen 12333;
-  root /var/www;
+  root /torrents;
   index /_h5ai/public/index.php;
   try_files $uri $uri/ =404;
   location /_h5ai/ {

README.md

@@ -10,7 +10,7 @@ Included services are:
 - sonarr
 - jackett (included in the sonarr image)
 - plex
-- h5ai
+- h5ai (service accessible via `explore.hostname`)
 
 The front-end reverse proxy routes based on the lowest level subdomain (e.g.
 `rtorrent.example.com` would route to rtorrent). Since this is how the router