chore: update dco and fix github topics

Author: tboerger

.github/settings.yml

@@ -3,7 +3,7 @@ repository:
   name: kleister-ruby
   description: "Kleister: SDK for Ruby"
   homepage: https://kleister.eu
-  topics: kleister, minecraft, sdk, openapi, ruby
+  topics: kleister, minecraft, sdk, client, grpc, ruby
 
   private: false
   has_issues: true

DCO

@@ -2,9 +2,6 @@ Developer Certificate of Origin
 Version 1.1
 
 Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
-1 Letterman Drive
-Suite D4700
-San Francisco, CA, 94129
 
 Everyone is permitted to copy and distribute verbatim copies of this
 license document, but changing it is not allowed.