Feature: Standardized asset include paths

[ryanj]

In order to enable enhanced automation features on the repo (#181) we're doing a bit of cleanup work.

The following standardization is planned for static assets:

1. Script assets from the repo should be stored in the /scripts folder
2. Asset includes (images, yamls, etc ) should be stored under /assets/TRACK_SLUG/
3. Include paths must be updated to match the new file locations

Files that need to be moved can be found by running the following script from the root of the repo:

grep -sr raw.github . | grep -v katacoda | grep -v openshift-instruqt\/instruqt\/master\/assets | grep -v openshift-instruqt\/instruqt\/master\/scripts | grep openshift-instruqt\/instruqt\/master

[ryanj]

Tagging these assets to make things simpler, see #188 for solution