Chaos 475 api documentation (#523)

* feat(docs): updates to user and organisation api spec

* feat(docs): draft spec for campaign api

* fix(ci): update rust workflow to use actions/cache

* rewrite API yamal file using components/schema up to /api/v1/role/:role_id

* rewrite API yamal file using components/schema up to /api/v1/role/:role_id I guess

* rewrite API yamal file using components/schema up to /api/v1/role/:role_id I guess

* finished API doc

* Update rust.yml

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Co-authored-by: Kavika <kbpalletenne@gmail.com>
Co-authored-by: Alex_Miao_WSL <yuan_sen.miao@student.unsw.edu.au>