Remove manual table of contents for rendering on the docsite, which will
provide an automatic TOC.
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
Add a user manual for the bitfield generator that documents syntax,
semantics and basic concepts. Should also be able to serve as main
spec for what the tool is supposed to do.
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
