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

[Chris Johns (@chris)]

Chris Johns commented on a discussion: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/90#note_115569


Please cherry pick after merging to make a new MR and select the 6 branch.

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/90#note_115569
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