Update giteveryday.txt to fit man page formatting

Add standard man page section titles.
Also adjust anchor text markup for man page format.

Signed-off-by: Philip Oakley <philipoakley@iee.org>
add giteveryday to the manpages make list

Signed-off-by: Philip Oakley <philipoakley@iee.org>
Add deprecation note to old everyday.txt

Also include link to new man page.

Signed-off-by: Philip Oakley <philipoakley@iee.org>
add 'everyday' to the help --guides list

Signed-off-by: Philip Oakley <philipoakley@iee.org>
Update git(1) link to giteveryday

Signed-off-by: Philip Oakley <philipoakley@iee.org>