Remove unused irbfiles

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

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

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

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

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

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

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