2024.03.14 release

mirrors: remove maakpain.

Mirror maintaner is unsure about long term maintenance.

xbps/mirrors: Update from mirror shuffle

repositories/index: change formatting

Bold is more noticeable here.

res/build.sh: use lowdown instead of pandoc for mandoc output.

Given that pandoc is a haskell program, depending on it is bad due to
bootstrap and general platform compatibility concerns. Lowdown output
looks just as good if not better.

The ideal build will have the git repository available to it; builds
without the git repo will use SOURCE_DATE_EPOCH from the environment.

res/install.sh: fix PDF file to install.

Pick A4 as the default for now, open to suggestions.

user-services: suggest variable instead of alias.