feat(docs): add the os menu

[gautamgambhir97]

Proposed Changes

Add a OS toggle for commands in docs

Linked Issues

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Types of changes

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• Content update.
• Bug fix (non-breaking change that fixes an issue).
• New feature added (non-breaking change that adds functionality).
• Breaking change (fix or feature that would cause existing functionality to stop working as expected).
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Checklist

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• I have read the CONTRIBUTING guide
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Further comments

[if this is a relatively large or complex change, kick off a discussion by explaining why you chose the solution you did, what alternatives you considered, etc...]

[devjsc]

Added the OS tab to individual code blocks as we discussed and designed. I think api-endpoint could be renamed now to code-blocks or similar to reflect better what it is. Will need to review designs again as I am concerned we could clutter the flow in guides with multiple selectors etc.