bashrc configs: separate out generic ubuntu configs

Signed-off-by: Andrew Turner <andrewjamesturner0@gmail.com>
bashrc configs: move du aliases into their respective generic files

Signed-off-by: Andrew Turner <andrewjamesturner0@gmail.com>
Makefile: create new generic ubuntu rules

* rename original rule as "work"
* create new generic rule "ubuntu"

Signed-off-by: Andrew Turner <andrewjamesturner0@gmail.com>