vimrc: Close folds when opening files (default behaviour)

It's way more comfortable when working with a plain text todo file which
is grouped by indentation, or massively large files. zR isn't that hard
to type anyway.

Signed-off-by: Carl Helmertz <chelmertz@op5.com>
x: New keyboard (big apple one) instead of builtin mbpro

Signed-off-by: Carl Helmertz <chelmertz@op5.com>