Update maintenance guidelines

[joethreepwood]

Changes

Michi noticed this was outdated.

Checklist

• Words are spelled using American English
• Titles are in sentence case
• Feature names are in sentence case too. It's "product analytics" not "Product Analytics" and so on.
• Use relative URLs for internal links
• If I moved a page, I added a redirect in vercel.json
• Remove this template if you're not going to fill it out!

Article checklist

• I've added (at least) 3-5 internal links to this new article
• I've added keywords for this page to the rank tracker in Ahrefs
• I've checked the preview build of the article
• The date on the article is today's date
• I've added this to the relevant "Tutorials and guides" docs page (if applicable)

[vercel]

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Project	Deployment	Preview	Updated (UTC)
posthog	Ready	Preview	Oct 16, 2025 10:59am

[greptile-apps]

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