NGINX Reverse proxy settings to Github pages

gihtubpage.conf

server {
        listen 80 default_server;
        listen [::]:80 ipv6only=on default_server;
        server_name splunk.net blog.splunk.net www.splunk.net .taddevries.com;
        access_log /var/log/nginx/blog.access_log main;
        error_log /var/log/nginx/blog.error_log info;
        return 301 https://blog.splunk.net;
}

server {
        listen 443 default_server;
        listen [::]:443 ipv6only=on default_server;
        server_name blog.splunk.net;
        ssl on;
        ssl_certificate /etc/nginx/ssl/2013_blog_bundle.crt;
        ssl_certificate_key /etc/nginx/ssl/splunk_4096.key;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH;
        ssl_prefer_server_ciphers on;

        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;

        add_header Strict-Transport-Security max-age=31536000;
        add_header X-Frame-Options DENY;

        access_log /var/log/nginx/blog.secure.access_log main;
        error_log /var/log/nginx/blog.secure.error_log info;

        client_max_body_size 4m;

        location / {
                proxy_pass              http://taddevries.github.io;
                proxy_redirect          default;
                proxy_buffering         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-Protocol    $scheme;
        }

        location /wp/64bit-putty {
                return 301 https://blog.splunk.net/64bit-putty;
        }
}

Sorry mmm... Where do you add this file to work?

nginx: [emerg] "proxy_redirect default" cannot be used with "proxy_pass" directive with variables

Hello, I tried using it, but got 404 (I try show site content on main domain without redirect to github);

Where I wrong? (Main difference from you - I not use SSL)

EDIT:
All is fine, I just add CNAME in the repository settings - after it, I got it is works