dead-symlinks: add script to find dead links

Signed-off-by: Christopher Larson <kergoth@gmail.com>
zsh config rework, use prezto rather than oh-my-zsh

Signed-off-by: Christopher Larson <kergoth@gmail.com>
Update gitignore files

Signed-off-by: Christopher Larson <kergoth@gmail.com>
Merge remote-tracking branch 'origin/master'

* origin/master:
  dead-symlinks: add script to find dead links