* updates Tower page to talk about RHAAP
* updates scenario guide Tower references
* updates Tower references to use AWX and/or RHAAP
* more scenario guides fixes
* fix CI failures
* Update docs/docsite/rst/porting_guides/porting_guide_2.8.rst
* removes tower link
* for 2.8, still mention Tower along with AWX and RHAAP
* aws guides should be updated in the collection, where they now exist
Co-authored-by: Alicia Cozine <acozine@users.noreply.github.com>