Developer dashboard

[emilk]

I want a (public!) developer dashboard web page, for easily finding links and an overview of the state of things.

It should include links (and perhaps a summary of):

• Our benchmark tracking
• re_sdk dependency count tracking
• Our wasm/rrd size tracking
• The latest and nightly web app build
• CI-state of our repos (rerun, landing, …)
• Instructions on how to install the latest alpha and nightly of the viewer (including npm package)
• Link to our (non-public) app analytics
• Link to our (non-public) website analytics
• Link to our most important repositories
• …

Implementation

We have most of this graphs already, we just need to collect these.

But maybe we should release some of them with PostHog which we already use for other stuff

In the meantime

We have it on our private Notion: https://www.notion.so/rerunio/Developer-links-dashboard-1cb8968e988340628cf2d1145d7e4aa6?pvs=4

[emilk]

I consider this high priority.

This PR added 70 dependencies to re_sdk, and nobody noticed for TWO MONTHS even though we had a bot post about it on the PR.

If we had a developer dashboard that we would look at during standup or retro, this would not have slipped by.

[Wumpf]

There's a posthog github action that could be useful for this if we decide not to dogfood on this https://github.com/PostHog/posthog-github-action