Add a mapping to edit vimrc

Signed-off-by: John Else <john.else@citrix.com>
Rearrange vimrc

Signed-off-by: John Else <john.else@citrix.com>
map -> nnoremap

Signed-off-by: John Else <john.else@citrix.com>
Add comments to vimrc

Signed-off-by: John Else <john.else@citrix.com>