Organisation wide GitHub configuration files

Pushed to:

• https://github.com/gleam-experiments/.github
• https://github.com/gleam-lang/.github

git remote set-url --add --push origin [email protected]:gleam-experiments/.github.git
git remote set-url --add --push origin [email protected]:gleam-lang/.github.git