docs: restored page on roles in security, executed other touchups, and… (#11978)

* Restored docs page on roles in security, executed other touchups, and renamed docs readme.txt to readme.md

* missed a url anchor on the security page

* fixed licensing issue and limited char width to 80

* fixed licensing issue and limited char width to 80

* whitespace experiments

* removed 2 periods

* staging whitespace

* addressed Robs feedback

* implemented robs second round of feedback on public_role_like