Additional config from live testing

[epowell]

• Added a setup-ssl.sh script and documentation to automate obtaining and installing a Let's Encrypt SSL certificate with certbot, ensuring secure HTTPS by default
• Updated the Apache mediawiki.conf to immediately redirect HTTP to HTTPS, use a self-signed certificate as a placeholder, and block access to sensitive files and directories, improving overall security
• Added logic to install static assets (logos, favicons) from a dedicated assets directory and ensure proper permissions, and introduced a robots.txt to control search engine crawling
• Updated Discourse SSO authentication to use the new hook-based configuration required by recent extension versions, replacing deprecated global variables and improving group mapping logic (config/mediawiki/LocalSettings.php).
• Removed the deprecated RenameUser extension and made minor updates to extension loading and configuration for compatibility and security (config/mediawiki/LocalSettings.php).
• Reduced the default root volume size in the Packer template, saving storage costs (packer/mediawiki.pkr.hcl).
• Installed certbot and removed unnecessary default Apache configuration files during provisioning to avoid conflicts and improve security (packer/scripts/03-httpd.sh).