Assets missing on subfolder install

[Hash Borgir]

I hope it helps someone:

I wanted to do this, so I landed upon this thread. I had already created nginx proxy for my domain. So I basically just added /discuss (or whatever location you want)

server {
    listen 443;
    listen [::]:443;
    server_name site.com;
    
    access_log off;
    error_log /var/log/nginx/site.com-error.log;
    
    open_file_cache          max=2000 inactive=20s;
    open_file_cache_valid    60s;
    open_file_cache_min_uses 5;
    open_file_cache_errors   off;
    
    ######################################################################
    ## SSL Configuration
    ##
    ## Only use this block if you are setting up the SSL (HTTPS) server
    ## definition of your site.
    ######################################################################
    ssl on;
    ssl_certificate /etc/letsencrypt/live/site/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/site/privkey.pem;
                
    ssl_session_timeout 5m;
                
    ssl_protocols SSLv3 TLSv1;
    ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
    ssl_prefer_server_ciphers on;
                
                
        location /discuss
                {
                proxy_pass         http://127.0.0.1:4567/;
                proxy_redirect     off;
                proxy_set_header   Host             $host;
                proxy_set_header   X-Real-IP        $remote_addr;
                proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
                proxy_set_header X-Forwarded-Proto $scheme;
                }
    # Custom 404
    error_page 404 = /404.html;

}

However, there are many other issues.

If I specify in config.json url as site.com/forum or something, css files don't load.

If I don't, if you click on anything, it will try to go to site.com/post/2/something instead of site.com/forum/post/2 etc.