Monorepo [0/?] - move move github actions to root

About

This pull request is a part of the effort of migrating to monorepo structure:

Moving .github directory to the root of the project, alongside with fixes that regard new repository structures.

This pull request won't fix CIs which are being tackled in

No CI should fail on a step related to the change of the monorepo structure.

[ ] All CI pass
[ ] Precommit scripts work properly
[ ] react-native-reanimated is a separate workspace which uses hoisted node_modules
[ ] app is a separate workspace which uses hoisted node_modules
[ ] paper example is a separate workspace which uses hoisted node_modules
[ ] fabric example is a separate workspace which uses hoisted node_modules
[ ] web example is a separate workspace which uses hoisted node_modules
[ ] macos example is a separate workspace which uses hoisted node_modules
[ ] example is a separate workspace which uses hoisted node_modules
[ ] reanimated eslint plugin is a separate workspace which uses hoisted node_modules
[ ] the npm package builds and works as expected
[ ] reanimated2 directory is removed
[ ] TypeScript, ESLint and Prettier configs are unified and only extended when necessary in workspaces