Jan 2025 documentation mega polish pass

[danielbachhuber]

• Create new doc that explains (primary and secondary) metrics @ivanagas
• Create new doc for shared metrics @ivanagas
• Remove "Experiment goal" out from "Creating an experiment"
• Update references and screenshots for "experiment goals" @ivanagas
• Create a new doc for "Viewing results", explain how to read the delta chart, and remove the existing from "Testing and launching" @ivanagas
• Refresh Creating a no-code web experiment @ivanagas
• In the statistics primer, add screenshots of delta charts to illustrate how the credible intervals tighten as you collect more data - this gets the point across even better @danielbachhuber

Related PostHog/posthog.com#9938

[danielbachhuber]

@ivanagas On the "Experiment metrics", could we have a section about custom exposure events?

[ivanagas]

On the "Experiment metrics", could we have a section about custom exposure events?

Maybe a h3 under Metric types?

[danielbachhuber]

@ivanagas Yep, I think that could work.

[danielbachhuber]

@ivanagas What's remaining out of the list?

[ivanagas]

Assuming this is "how to read Delta chart":

1. Remove (or edit) Viewing experiment results in Testing and launching
2. In the statistics primer, add screenshots of delta charts to illustrate how the credible intervals tighten as you collect more data. This gets the point across even better

I can do the first if you do the second :)

[danielbachhuber]

I can do the first if you do the second :)

Done! PostHog/posthog.com#10419

[ivanagas]

Anything else you think @danielbachhuber ?

[danielbachhuber]

@ivanagas Looks much better! Thanks for your help with this 🙌