Misc Updates

[brody192]

• Make CI fail if contentlayer warnings are found.
• Clean up next-sitemap config.
• Pin Node to v18, contentlayer was throwing an error on Node 19 - 20.
• Update the Laravel guide to mention the Pre-Depoloy command.
• Updated image on the basics page, new border image.
• Added a "Backups" section and image to the basics page.
• Added a "How to restore a backup" guide to the backups reference page.
• Tweaked the copy mentioning the small amount of filesystem overheard for volumes.
• Fixed the issue preventing the site map from being generated, SSG is done during build, and SSR is done during runtime now.
• Prevent inline code blocks from having their padding wrap.

Note: I have omitted a description to test CI.

[railway-app]

🚅 Previously deployed to Railway in the 🪄 *.railway.com project. Environment has been deleted.