I notice you have changed to GIT and do not mention SVN which still, mercifully, appears to work.
SVN will still work as readonly for quite a while, there are countless old sites on svn and no real plan to break all those so it'll be readonly for a while but if you want bugfixes or trunk you need to use git.
I hope you are not abandoning SVN access and it would be nice if you could still specify it on the install from source notes.
We are pretty much abandoning svn for the core and modules. Individual module authors can still choose to use SVN if they wish. You can also checkout github repos over svn (master branch only).
I know simon_w is painfally against git as well and he's trying to setup a subversion mirror of the repo so you may be able to use that.
I personally detest GIT.
Every tool has it's learning curves, Git much more than svn (which I loved and 'knew') but we had to move to git / github to help the core developers deal with the scale of the patches, submissions, branches coming in. It's already proved to improve dealing with large patches and collaboration efforts so hope you give it a chance!