Documentation | README: Update to book theme (!90)

[Gedare Bloom (@gedare)]

Gedare Bloom commented: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/90#note_115567


We'll need to backport this to `6`. I'm not sure how we want to manage that yet. I'll discuss in discord.

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/90#note_115567
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