chore(doc): update bedrock documentation

[krokoko]

Fixes #

• split the existing Bedrock readme into multiple files
• add documentation about some of the features missing from the current document

Missing:

• creating a data source section wrong

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[MichaelWalker-git]

LGTM

[mergify]

This pull request has been removed from the queue for the following reason: pull request dequeued.

Pull request #1069 has been dequeued. The pull request could not be merged. This could be related to an activated branch protection or ruleset rule that prevents us from merging. (details: You're not authorized to push to this branch. Visit https://docs.github.com/repositories/configuring-branches-and-merges-in-your-repository/managing-protected-branches/about-protected-branches for more information.).

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.
If you do update this pull request, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.

[MichaelWalker-git]

LGTM