Changed all gitlab.com URLs to git.maneage.org

Until now, we were primarily linking people to the Gitlab fork of this
paper. However, since this paper is part of Maneage, its main repository is
on Maneage's own server at http://git.maneage.org/paper-concept.git

With this commit therefore, all the gitlab.com URLs have been corrected to
owr own Git server.

While looking into Git-related points, I also noticed that in the demo code
listing showing how to clone Maneage and start a new project, we were using
Git's old/depreciated 'master' name. Git (and almost all common
repositories) now use 'main' as the default branch name, so this has also
been corrected here.

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