Rewrite existing man pages in mdoc(7) format
Rename uzbl(1) to uzbl-core(1)

Since there is no command called 'uzbl' this man page should only focus
on the uzbl-core command.
Typos
Merge remote-tracking branch 'gh/nmeum/manpages' into next

* gh/nmeum/manpages:
  Typos
  Rename uzbl(1) to uzbl-core(1)
  Rewrite existing man pages in mdoc(7) format