docs: overhaul README.md and adoc

This commit aligns the documentation with the actual CLI implementation
and adds several previously missing subcommands.

Co-authored-by: DGonzalezVillal <97119524+DGonzalezVillal@users.noreply.github.com>
Signed-off-by: Takuma IMAMURA <209989118+hyperfinitism@users.noreply.github.com>

Author: hyperfinitism