README link points to resource that does not exist

[anevins12]

The following blurb and link points to a webpage that no longer exists and redirects to a generic and unhelp page on the TPGi website:

For further information, see The Paciello Group's aViewer resource page.

[danomah]

Suggest changing to https://github.com/ThePacielloGroup/aviewer/releases

[anevins12]

Also noticed the GH demo page points to the same outdated resource