Remove all the Griffith branding

[djplaner]

Describe the bug All that docs/readmes currently include Griffith U branding.

Expected behavior Replace with CASA-U branding

[djplaner]

Status

Progress - reference here

Redo videos on concepts page

Annotated images

• [x] first image on navigation page
• [x] configuration
• [x] module configuration
• [x] navigating live collections
• [x] navigating claytons collections
• [ ] designing the use of Collections