Refactor install logic, use file-based overrides per OS/distro

installs_and_builds/custom_dmenu_default

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# for now, use luke's build; i can make my own fork later if desired
+git clone https://github.com/LukeSmithxyz/dmenu.git
+
+pushd dmenu > /dev/null
+sudo make clean install
+popd > /dev/null