Migrate product specific getting-started docs

[ArthurKnaus]

Background

We already migrated the general onboarding docs from sentry-docs to sentry.
No we want to do the same for the product specific ones.

Currently they load the content from sentry-docs and display it in a sidebar.
The platforms that are supported for each product are allow-listed for each one:

• Performance docs are enabled for javascript & javascript-react
• Replay docs are enabled for every platform in replayPlatforms.
• Profiling is enabled every platform that returns a string in getDocsPlatformSDKForPlatform.

So there is a slight miss-match between supported products per platform in the onboarding & supported platform per product in the product specific docs.

Proposal

1. Update the steps() functions so they always build the whole content. Atm for some platforms a part of the content is being injected.
2. Ensure the functions share a common interface that allows for switching single features on / off.
   (e.g. only render performance content)
3. Support experimental & beta profiling platforms in those functions.
4. Adapt product specific docs to load the content via the relevant step() function and render it using their own layout.

Open questions

• How should we handle multi-snippet docs?
  • e.g. display the selector, store the onboarding selection or just display the default choice for each platform
• Should we extend the supported platforms for the performance docs?
• Should platforms with experimental profiling display it in the onboarding docs?

Further todos

• clicking on “set up profiling” does not pre-fill the currently selected project in the profiling docs -> we should fix that.

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This issue is a result of this spike #53861

Phase 1

Preview Give feedback

1. Communication with other teams #56547
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2. Create prototype for config structure #56548
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3. Add forking logic so that we can migrate incrementally #57447
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4. Refactor / streamline all platforms #56549
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5. Update contribution docs https://docs.sentry.io/contributing/onboarding-wizard/

Phase 2

Preview Give feedback

1. Prepare content for sidebars (each platform individually) #56550
   0 of 29
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2. Convert profiling sidebar #56551
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3. Convert replay sidebar #56552
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4. Convert performance sidebar #56553
   9 of 10
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