[TASK][DOC] Convert manual to reStructuredText

Change-Id: I0ecdf319d4cec83c466bba21c509cb681f94a06c
Resolves: #57049
Reviewed-on: https://review.typo3.org/28500
Reviewed-by: Tomas Norre Mikkelsen
Tested-by: Tomas Norre Mikkelsen
Reviewed-by: Thomas Loeffler
Tested-by: Thomas Loeffler