docs(release): detailed doc on how to release / update

Relates to #74
7 jobs for !175 with docs/feature_checklist in 7 minutes and 49 seconds
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Status Job ID Name Coverage
  Check
passed #896513
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check_back

00:00:21

passed #896514
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check_front

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  Test
passed #896515
docker
test_back

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80.0%
passed #896516
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test_frontend

00:03:38

 
  Lint
passed #896518
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eslint

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passed #896517
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flake8

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  Svg Gen Docu
passed #896519
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generate_UML_svg

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