Script to set up nginx config and generate certificates through Certbot

[roerohan]

The script should be able to

• Generate nginx config file with necessary parameters such as server_name, root, etc. in /etc/nginx/sites-available, with name same as server_name
• Link /etc/nginx/sites-enabled/server_name to the generated file
• Generate SSL certificates through sudo certbot --nginx
• Test if there are any errors with sudo nginx -t
• Restart nginx server with sudo nginx -s reload