Add documentation of bot commands and fix some devdocs (#43399)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

* Fixes location of `style.md` file
* Deletes duplicated `localization.md` file
* Adds documentation about the bot commands.
* Adds links to aka.ms link docs and the new document

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## PR Checklist

- [ ] Closes: #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Dev docs:** Added/updated