- Now making use of the 'shell-completion' eclass
- Removed 'zsh-completion' USE flag (completion is now installed
undonditionally)
- No longer building manpage since it's pre-built in the release
- Therefore: No longer depending on app-text/pandoc at build time
- Removed weird total blocking of app-shells/zsh-completion. Now
soft-blocking app-shells/zsh-completion < 0.34.0 because it used to
install the zsh completion '_cheat' before 0.34.0.
Signed-off-by: Jonas Frei <freijon@pm.me>
