Use absolute path for git sslCAinfo

The setting requires an absolute path. Since the absolute path to my
home directory varies by environment, I've moved that setting to
.gitconfig.local instead.
Stop using Perlbrew for now

Too many different environments don't have a good version of Perl
installed, so Perlbrew doesn't work to put the desired version on the
path. For now, it's better to just not use it at all.