Landing page for the Teams add-on (and other add-ons)

[andyvan-ph]

We don't have a page on the website (outside of pricing) that explains the Teams plan, and it's hard to find on the pricing page.

Would be good to have a dedicated page for this and other add-ons, preferably one that pulls from the billing service so it remains up to date.

Options:

• Dedicated landing page for add-ons
• Section of the docs that explains the add-ons that we can link to sometimes

[corywatilo]

We added this a little while ago: https://posthog.com/addons

Do we want pages for specific add-ons or does this do the job?