make docs: generate Markdown and man pages in doc/
make install-docs: install man pages to be usable directly
Docs are generated from the ezdoc files in doc/src/.
We now describe how to build a hello world application from
start to finish, including setting up erlang.mk for building,
and using relx for generating the release. All concepts are
not explained in details of course, but we don't need to at
this point, we just want things to be working.