feat(notifications): add section about funding.yml in GitHub Signup email (#2445)
feat(notifications): add section about funding.yml in GitHub Signup email (#2445)

* add funding.yml

@znarf Is there any way I can test this email on staging or see a preview?

* fix link

* copy update

OpenCollective/opencollective-api,OpenCollective/opencollective-api,OpenCollective/opencollective-api