vim: change gui font to source_code_pro:10

Signed-off-by: Tw <tw19881113@gmail.com>
x: change cache dir to /tmp/.cache instead of ~/.cache

Signed-off-by: Tw <tw19881113@gmail.com>
dwm: tag start from 0 instead of 1

Signed-off-by: Tw <tw19881113@gmail.com>
dwm: add xlock shortcut: <c-L>

Signed-off-by: Tw <tw19881113@gmail.com>