Load Oh-my-zsh before topic folders

Any settings from OMZ should be the base config,
and anything put into the topic folders should override
that base config. Doing it the other way around causes
confusion when things in your topic files don’t work
because they are being invisibly overwritten by some
oddball plugin in OMZ.

For example: It’s common to alias “ls” in your topic
folders, but OMZ’s common-aliases plugin also
aliases ls and will overwrite your aliases
Correct plugin set for upstream