Remove some unused scripts
bin/gensetup: aurget has no deps
vimrc: ctags on current directory
zsh: clean command string in title printing

* Strip after first newline to prevent unexpected output
* Escape dollars to prevent expansion errors
bin/gensetup: simplify script by being less pretty
bin/ghc-pkg: no more yesod packages

Install just basic packages, use cabal sandbox for yesod projects.