Draft: Generate /about/ pages with Zola

To test:

1. Start Hagrid as usual; the port is :8080

2. Start Zola:

   zola serve --base-url /

   The port is :1111

3. Set up a reverse proxy. Proxy everything to :8080, but the /about/ path to :1111. Example Caddyfile:

   :9999 {
       handle /about/* {
           reverse_proxy 127.0.0.1:1111
       }
   
       handle {
           reverse_proxy 127.0.0.1:8080
       }
   }