Relative linking in Handbook, Docs, Blog

[corywatilo]

I've noticed a lot of FQDN links inside of Handbook, Docs and Blog posts.

Example:

https://posthog.com/foobar

Best practices are (or at least used to be) to use relative linking when you're linking to your own site:

/foobar

A byproduct of relative linking is that when developing locally and clicking a link, you don't inadvertently end up on posthog.com and spend 20 minutes trying to figure out why you're not seeing changes reflected.

Even though it might not matter as much for SEO anymore, can we agree to try to use relative linking whenever possible?

(Could be worth making a bullet point in contribution guidelines)