Intial documentation refactor

[matejmatuska]

The documentation is reorganized to adhere to the new hierarchy design and also drops the documentation related to oamg/leapp-repository and related direct references.

Note that some pages/sections might feel a little out of place or miss some content (most notably building-blocks-and-architecture and libraries-and-api), that's expected and these places will be filled in in future patches.

A few typo corrections are also included.

Depends on #854

[github-actions[bot]]

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[matejmatuska]

Rebased

[matejmatuska]

Comments addressed and I also rebased.