Move muttrc to the dotfiles root
Remove git_template and hooks

I never use these.
Remove irbrc and pryrc

I never use these either.
Remove reference to osxkeychain
Fix spelling of amend
Change commit alias to include -v flag

This includes the commits diff in the commit message buffer.
Use my personal email account as default sender
Configure msmtp properly

* Tell mutt to use the right binary
* Hook it up to the gnome keyring
Correct mailbox names