Fix password for personal gmail

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Add keymaps to switch between mailboxes

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Specify default cran mirror

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Remove unused r_packages

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>