PSA: Merge with neothor's fork [Action needed]

[Trojaner]

This repo has been merged with @neothor's fork of it.

Required actions:
If you use docker, replace Authentication_Steam__ApplicationKey with Steam__ApplicationKey.

Changelist:

• Added GitHub workflows integration for pushing images, closes #14
• Logout support
• Added logging
• Added example and dev docker-compose.yml's with nginx, keycloak and postgres (with https support)
• Fix for when username is not available (will use SteamID instead)
• Updated NuGet packages
• Replaced Netwonsoft.Json with System.Text.Json
• Code reformat
• Restructured folders

Huge thanks to @neothor for forking the repo and updating it.