#764 Adhere to new requirements for developer info.

• Best to review per commit.
• Changes:
  • Account for multiple source code repositories.
  • Update way of working: just create issue, no dev-list needed.
  • Adhere to new requirements:
    • Indicate how to build the repo already in the CONTRIBUTING file.
    • Indicate branches to use already in the CONTRIBUTING file.
  • Link from NOTICE file to CONTRIBUTING file.
  • Add mandatory files to the website repo, through the deployment of the website. This makes it easier to keep the updated. And it keeps the website repo a deployment-only repo.

Fixes #764 (closed)