Add Pre-Commit Hook to Clear Outputs

[fayvor]

• Add a pre-commit hook configuration for clearing outputs from committed notebooks in:
  • granite-code-cookbook
  • granite-legal-cookbook
  • granite-snacks-cookbook
  • granite-kitchen
• Document the hook in the community wiki

[fayvor]

Code PR here (piggyback on #138). -merged

[fayvor]

Legal PR here (piggyback on #138). -merged

[fayvor]

Snack PR here (piggyback on #138). -merged

[fayvor]

Kitchen PR here. -merged

[rawkintrevo]

https://github.com/ibm-granite-community/granite-code-cookbook/pull/129 is blocked bc of our misconfigured git. But ott these are all approved and merged

[fayvor]

One TODO left: Document the hook in the community wiki.

[rawkintrevo]

sorry you can reopen if you want (or i can if you can't)

[fayvor]

Ok, documentation is in the wiki here.