Several improvements to generator-sprotty, fixed links

[spoenemann]

• Updated GitHub links to new organization name eclipse-sprotty
• Link to the documentation on the new website instead of the Wiki
• Removed contributors from all package.json files because they were outdated and we already have an overview here
• Added missing LICENSE file to generator-sprotty
• Reordered package.json for consistency with the other packages
• Downgraded chalk to 4.1.2 because version 5 is for ESM modules
• Yeoman generator template:
  • Configured routing points to avoid errors on edge selection (Bad dev experience with edge selection and routing #368)
  • Added mouseover and selection styles
  • Fill viewport height with the diagram
  • Removed package-lock.json so we don't have to keep it up-to-date
  • Added inversify dependency

[dhuebner]

Looks good! Yeoman generator works good too.