Add documentation for developing workflows

Migrate the old gitlab wikipages about developing to the new documentation. I inserted the pages under contribute -> contributing to source code.

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• 0878f4c3 - add documentation for setting up developing in docker container

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added 8 commits

• 0878f4c3...6fe1e341 - 6 commits from branch master
• 94f476ae - migrate old dev wiki pages to new documentation
• 9d2fabe3 - add documentation for setting up developing in docker container

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added doc for setting up using docker

Small things I realized when building PeTrack from source on a clean Ubuntu system:

• Qt version needs to be exactly Qt 5.14
• Probably helpful to add that you also have to install opencv-contrib if you compile OpenCV yourself or else the aruco header is missing
• Maybe remove the how to execute tests part from here so it isn't double but I can also do that in my MR

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• 1beb9ac3 - remarks from MR

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added 2 commits

• afcffe4a - migrate old dev wiki pages to new documentation
• 2ceb9b65 - add documentation for setting up developing in docker container

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added 9 commits

• 2ceb9b65...f9b98913 - 4 commits from branch master
• 94f476ae - migrate old dev wiki pages to new documentation
• 9d2fabe3 - add documentation for setting up developing in docker container
• 1beb9ac3 - remarks from MR
• b1785c20 - merge older changes
• 9577c789 - fix qt version

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enabled an automatic merge when the pipeline for 9577c789 succeeds

merged

mentioned in commit 9439addd