Resolve "GitLab Shell no longer needs Redis"
#1991 (closed) shows that GitLab Shell hasn't needed Redis to operate in a long time.
Gitaly & GitLab Shell charts have had Redis as a dependency, but have no requirements for it now. (Gitaly uses GitLab Shell).
- Remove the configuration of Redis values from both charts
- Remove the templating of Redis values from both charts
- Update the documentation for each chart to reflect this removal.
Closes #1991 (closed)
Edited by Jason Plum