The URL changed slightly.

Code extracted from:

    https://gitlab.kitware.com/third-party/diy2.git

at commit f7a68da4fbe93ae7a8699b66f125a98ace842998 (for/vtk-m).

This includes updated to the latest master. To help with that,
I added an alias to SetupForDevelopment.sh to update the
master branch regardless of what branch you are on.

Code extracted from:

    https://gitlab.kitware.com/third-party/taotuple.git

at commit ae4936580baf117373e73c23f0f8407d7589e6ff (for/vtk-m).

Found via `codespell -q 3` via downstream VTK

Removed some things from README that are better referenced in the
User's Guide. Updated some text. Reformatted things.

The contributing document referred to a download page that does not
exist. Since all necessary information is right there in the
document, simply delete the dead link.

Fixed bad directory name for clone command.

Added suggestion to sign up for mailing list.

Corrected statement about the location of data files.

Flesh out the commit message section to inform new git users on what
the proper style of a good message looks like.