v1.3.0 (final)

For run instructions view README.md.

What's Changed

• Added documentation by @dorianim @LadnerJonas @lamorak13 @mariusdkm @Nomiez
• Fix typos by @Nomiez
• Move to Mail API keys to environment variables @mariusdkm
• Remove unused file by @LadnerJonas in #187
• fix typo in data.sql by @LadnerJonas in #188
• Add documentation submodule by @LadnerJonas and @dorianim in #189
• remove pushToBitBucket workflow patch by @LadnerJonas in #191

Full Changelog: v1.1.0...v1.3.0