Enhancement/improve docs

Daniel Scheffler requested to merge enhancement/improve_docs into master
  • Revised the documentation layout.
  • Added missing doc requirements.
  • Revised documentation (needs to be further improved).
  • Activated 'pages' CI job also for enhancement/improve_docs.
  • Further improved documentation.
  • Removed installation section from README.rst.
  • Fixed an error in the documentation.
  • Added some documentation about the GMS infrastructure.

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