API docs

[mrq1911]

• [ ] generate API / RPC / extrinsic docs (use same tool as https://polkadot.js.org/docs/substrate/rpc#author or revive https://apiexplorer.dev/ - https://github.com/galacticcouncil/substrate-api-explorer)
• [ ] deploy and merge into (or atleast link to) https://docs.bsx.fi/
• [ ] add to ci workflow

[Roznovjak]

Our substrate-api-explorer has not been maintained for some time and currently is not working and would need an update. It looks like that polkadot rpc api docs are generated using this command, but I wasn't able to use it for generating the api docs for ourselves nor track down the code responsible for actual doc generation.

[jak-pan]

apidocs.bsx.fi revived