Rename all the files which will be edited substantially in the next commit, without changing their
contents
Docs will not build for this ocmmit.
This is done so that git doesn't decide we renamed xxx-cmake -> xxx-legacy in the next commit, which
is what it will infer otherwise (and makes rebasing more of a pain than it should be)
1. Moved get-started files, 7 documents in total, from get-started-cmake folder to hw-reference folder;
2. Deleted get-started files, 7 documents in total, in get-started folder;
3. Updated links in get-started-cmake/index.rst and in get-started/index.rst;
4. Modified descriptions for build system in these files.
Using 'sudo pip install' can cause a lot of problems because usually
there are a couple of Python interpreters installed. This fix encourages
developers to use `pip install --user` instead which is safer.
* "git clone" command and a small version header are generated
depending on git properties.
* Add Versions page with details about each version
* Make it clear using master branch is living on the "bleeding
edge"
