Update developing plugin documentation
TODOs - [ ] update the current docs to be in line with the current plugin protocol/functionalities - [ ] generalize the current docs, removing Area C specificity - [ ] add Area C specific descriptions / clarifications on the topic in the "domain-specific" section (this will be a combination of some of the current docs and some of the docs that we have in the Area C doc repo) @ladinesa @pizarroj @ndaelman
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