This will hardcoed "/gitea" subpath in root server to the 3001 port.. 

This configuration will NOT hiyacked all the webserver root to gitea..
will use the subpath "/gitea" url from the configured domain, see ROOT_URL:

Update /etc/gitea/gitea.ini:

```
[server]
ROOT_URL = %(PROTOCOL)s://%(HTTP_ADDR)s:%(HTTP_PORT)s/gitea
```

Added to h2o_localpaths.conf or create an new file and under a path:

```
      "/gitea/":
        proxy.reverse.url: "http://0.0.0.0:3001/"
        proxy.preserve-host: ON
```

