Working?

nginx.conf

worker_processes auto;
user www-data;
pid /run/nginx.pid;
daemon off;

events {
    worker_connections 1024;
    accept_mutex off;
}

http {

    sendfile on;
    gzip on;
    gzip_comp_level 6;
    gzip_min_length 20;
    gzip_proxied any;
    gzip_types text/plain text/css application/json application/x-javascript application/javascript text/xml application/xml application/xml+rss text/javascript;
    gzip_vary on;
    gzip_disable "MSIE [1-6]\.(?!.*SV1)";

    proxy_cache_path /tmp/nginx_cache levels=1:2 keys_zone=gh-pages:10m inactive=360m;
    proxy_cache_key "$scheme$request_method$host$request_uri";
    proxy_temp_path /tmp/nginx;

    server {
        listen 80;
        server_name rabbot.io;
        return 301 https://$server_name$request_uri;
    }

    server {

        listen 443 ssl http2;
        server_name rabbot.io;
        
        # letsencrypt
        ssl_certificate /etc/letsencrypt/live/rabbot.io/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/rabbot.io/privkey.pem;

        # SSL Security: https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
        ssl_protocols TLSv1.2;
        ssl_ciphers 'kEECDH+ECDSA+AES128 kEECDH+ECDSA+AES256 kEECDH+AES128 kEECDH+AES256 kEDH+AES128 kEDH+AES256 DES-CBC3-SHA +SHA !aNULL !eNULL !LOW !kECDH !DSS !MD5 !EXP !PSK !SRP !CAMELLIA !SEED';
        ssl_prefer_server_ciphers on;
        add_header Strict-Transport-Security "max-age=31536000; includeSubdomains; preload"; 
        add_header X-Frame-Options DENY;
        add_header X-Content-Type-Options nosniff;

        # openssl dhparam -out dhparam.pem 4096
        ssl_dhparam /etc/nginx/ssl/dhparam.pem;

        # SSL performance
        # https://imququ.com/post/my-nginx-conf-for-wpo.html#toc-4
        # https://raymii.org/s/tutorials/OCSP_Stapling_on_nginx.html
        # "AddTrustCA.crt"
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout      10m;
        ssl_session_tickets      on;
        ssl_stapling             on;
        ssl_stapling_verify      on;
        ssl_trusted_certificate /etc/nginx/stapling.pem;

        # http2 server push
        add_header Link '</css/main.css>; rel=preload; as=stylesheet';

        add_header Host rabbots.github.io;
        server_tokens off; # removed pound sign

        location / {
            proxy_cache gh-pages;
            proxy_cache_valid 200 302 1h;

            proxy_pass https://rabbots.github.io;
            proxy_redirect https://rabbots.github.io https://rabbot.io;
            proxy_redirect http://rabbots.github.io https://rabbot.io;
        }
    }
}