add list of valid commit scopes to git-conventional-commits.json

[cedricschwyter]

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[cedricschwyter]

must include:

• renderer - for all things lumium-renderer
• db - for all database migrations and other db related things
• workspace - for all things related to workspaces
• auth - all things related to authentication and authorization
• ...

[cedricschwyter]

can be extended if a change does not fit into one of the existing categories