Rename this repo

[vkurup]

I was successfully (and pretty easily) able to use this repo for a Phoenix/Elixir app. The only things that are specific to Django are the commands that we use to run migrate and collecstatic but those are optional and configurable, so maybe it makes more sense for this repo to be named ansible-role-k8s-web-app (which then accompanies ansible-role-k8s-web-cluster nicely).

From my read of https://docs.github.com/en/github/administering-a-repository/renaming-a-repository , links to git clone should still be redirected from the old repo name to the new repo name, so we wouldn't need to change existing projects immediately (though of course, it would be nice to change them at some point)