Fix local haddock generation

[kejace]

We seem to be running into this: polysemy-research/polysemy-zoo#55

hs-abci-sdk         > <command line>: Could not find module ‘Polysemy.Plugin’
hs-abci-sdk         > Use -v to see a list of the files searched for.

One potential fix would be to have a custom Setup.hs like here: https://github.com/achirkin/easytensor/blob/4cc9a381ad09c7a013a121cc02231f0ac2de649d/dimensions/Setup.hs

However, for hs-abci-sdk, we already have a custom Setup.hs so some work is required.

If we decide to only use haddock for pushing docs to the website (#190), then a workaround is to do what's suggested in the issue polysemy-research/polysemy-zoo#55 by temporarily disabling the plugins while building docs. This is is easy to put into the docs script.