Remove super-linter workflow

super-linter versions >= 6.0.0, < 8.3.1 are vulnerable to command
injection via crafted filenames that contain POSIX shell command
substitution syntax, i.e. $(...)

This repo only uses super-linter on the renderer/ subdirectory
and only for limited filetypes. I don't feel that the dependency
is really worth its weight in our case, and given this security
issue I'm choosing to remove it. We can re-add specific tools
(like shellcheck) later if we want them.

Author: jake-low