Copyright Customizations

[eemaanamir]

Add customizations of copyright as done in the following PRs:

• Ahmed arb/update default copyright #366
• feat: update share alike license text #363
• chore: change license text and link edx-frontend-app-learning#12

Implemented in the following PRs:

• chore: change license text and link edx-frontend-app-learning#20
• chore: change license text edly-io/frontend-app-authoring#2
• feat: select CC-SA license by default on course creation openedx-wikilearn-features#12
• feat: added custom authoring and learning mfes tutor-contrib-wikilearn#24
• chore: enable course licensing tutor-contrib-wikilearn#25