Merge the all documentation in the /docs folder

[jooola]

The documentation is currently split between the README.md and the /docs folder.

To ensure users of this tool properly configure HCCM, we need to improve the documentation so that users know where to find information and don't miss important information.

I propose to merge all the documentation in the /docs folder, provide a good documentation entry point that helps to navigate through it, and add some missing and critical documentation.

[github-actions]

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