Refresh contributing guidelines to match current situation #1359
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Reasons for creating this PR
The CONTRIBUTING.md document is quite old, from 2016. The development situation has changed since then so it needed a refresh.
Link to relevant issue(s), if any
Description of the changes in this PR
Update sections of CONTRIBUTING.md to match current situation and link to most recent resources.
Note that I have also added a link to CONTRIBUTING.md to the home page of the wiki (last section about development processes), as suggested in #1286.
Known problems or uncertainties in this PR
n/a
Checklist
.sr-only
class, color contrast)