Release v1.2.0

• Added: support for Python 3.10
• Added: "Research" link in footer
• Changed: use new audEERING logo
• Changed: mark extension safe
  for parallel read and write
• Changed: "Infrastructure" link
  in footer now points
  to http://devops.pp.audeering.com
• Changed: rename "Infrastructure" link
  in footer
  to "Infra"
• Changed: rename "Documentation" link
  in footer
  to "Docs"
• Removed: dependency to sphinx_rtd_theme;
  the required source files are now included