v0.7.0

Major changes:

• Use optimade-python-tools' v0.8 config-system (#70, @CasperWA)
  This allows to configure the server through environment variables and more, utilizing pydantic's powerful config system.
  See the relevant PR in optimade-python-tools for more information.

Updates:

• Use new OPTIMADE capitalization throughout the code (#67, @CasperWA)
• Update to latest AiiDA version (#67, @CasperWA)
• Run reentry scan in Dockerfile after installing aiida-core (#67, @CasperWA)
• Move to using GH Action services for testing with AiiDA-needed services (PostgreSQL & RabbitMQ) (#67, @CasperWA)
• Redirect all non-major version prefix URLs to major-version prefix URLs for the OpenAPI docs endpoints (#72, @CasperWA)
• Fix building source distribution, including missing files in MANIFEST.in (#76, @thatch)
• Fix misplaced keys in .codecov.yml (#78, @CasperWA)