:book: Updating and revamping CAPH doc entirely [WIP]

[Sayanta66]

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What this PR does / why we need it:

Docs restructuring which includes the rewriting of the quickstart guide by means of addition and eliminations. Baremetal and node image contents are separated.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• [ ] squash commits
• [x] include documentation
• [ ] add unit tests

[Sayanta66]

@janiskemper @kranurag7 - Can you both take a look at the new changes?

[janiskemper]

looks good!