Add Api Derives docs

[valentinfernandez1]

This PR adds documentation for the api.derives namespace including detailed infortation about each derive and it's usage.

Automatically generated from the polkadot-js/api code documentation.

[TarikGul]

Shouldnt we be bumping the version of the api here so it can have the new script for api derive generation?

[valentinfernandez1]

True, in this case I just brought the latest version on master using yarn polkadot-dev-copy-to docs . But that is a cleaner approach.

In that case we would have to wait for the next api release as some changes not yet part of the latest release.

[TarikGul]

Thats totally fine, lets get this in since it's already part of the 15.7.1 release, and we can hold off on the asset-hub updates until next release.

[TarikGul]

Interesting, any idea why the build is failing?

[valentinfernandez1]

Oh, yes I think I know what is going on. yarn build is running the generation script from typegen, which tries to parse from a local file instead of a dependency.

Since the build happens in the context of the docs it does not have access to the file when running on github actions

[valentinfernandez1]

The fix is required on the api side so let's wait for the next release to merge this PRs.

[TarikGul]

LGTM

[polkadot-js-bot]

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