[Mega Issue] Experiments UI

[jurajmajerik]

A list of outstanding issues that should be simple fixes.

General flow

• [ ] Prevent saving a funnel goal with <2 steps
• [ ] After launching, immediately reload the results to display the checklist
• [ ] Add modals for Launch/Stop/Reset/Archive actions with explanations
• [ ] https://github.com/PostHog/posthog/issues/21633

Statistics

• [ ] Explain why the main results are not statistically significant
• [ ] Show the current p-value for the results
• [ ] Show significance level ("Results are significant when the p-value is less than 0.05")
• [ ] Show significance for secondary metrics (is >90% all that’s needed?)
• [ ] "Significant results" - "unclear if it applies to primary metrics or also secondary metrics"
• [ ] https://github.com/PostHog/posthog/issues/21923
• [ ] https://github.com/PostHog/posthog/issues/21924

Misc

• [ ] Success banner has bad contrast in dark mode
• [ ] Add info tooltips/hide some explanation text inside tooltips
• [ ] "Still not sure about how to link tracked events to feature flag variant " - add info/link to docs in the "No results" section

[neilkakkar]

• [ ] https://github.com/PostHog/posthog/issues/21832
• [ ] I'd like the 'save as draft' and back buttons to be in the header also