Some bug fixes and final changes for release in 4.0.0

• Moved rst files for the read the docs user guide and tutorials to separate directories and added captions to the toc tree in index.rst.
• Made group --relaxation option required (either relaxation or ALL sub-values must be given)

requested review from @worku005

assigned to @worku005

added 3 commits

• b2fcaba5 - Updated README for 4.0.0
• f4cdc30e - Merge branch 'release_v4.0.0' into merge_release_v4.0.0_to_develop
• 65394703 - Changed components and homology_group_list BlockingQues to contain LinkedList...

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added 1 commit

• c3376414 - Changed other references of LinkedList to direct class instead of full paths to the class

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added 2 commits

• db13fd1a - Removed copied reference to read the docs manual
• e33d67cb - Merge branch 'release_v4.0.0' into merge_release_v4.0.0_to_develop

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approved this merge request

enabled an automatic merge when the pipeline for e33d67cb succeeds

mentioned in commit b2c4c592

merged