References to Fedora dependencies

Add the list of dependencies for Fedora systems.
We don't use asciidoc for man pages anymore

Update with the list of actual packages needed.
Cleanup gummiboot section

Fix typos and cleanup.
Remove ostree-init from ostree instructions

It's not used anymore.
Cleanup manifest section

maui main branch is now master which doesn't focus on 0.1, it's rather
the latest version.