Allow passing @storybook/addon-docs options via framework options

[guillaumewuip]

Fixes #77

[guillaumewuip]

Can't find a way to do better than this given the typings of @storybook/addon-docs/dist/preset:

import { PresetProperty, Options } from 'storybook/internal/types';

declare const addons: PresetProperty<'addons'>;
declare const viteFinal: (config: any, options: Options) => Promise<any>;
declare const webpackX: any;
declare const docsX: any;
/**
 * If the user has not installed react explicitly in their project,
 * the resolvedReact preset will not be set.
 * We then set it here in addon-docs to use addon-docs's react version that always exists.
 * This is just a fallback that never overrides the existing preset,
 * but ensures that there is always a resolved react.
 */
declare const resolvedReact: (existing: any) => Promise<{
    react: any;
    reactDom: any;
    mdx: any;
}>;
declare const optimizeViteDeps: string[];

export { addons, docsX as docs, optimizeViteDeps, resolvedReact, viteFinal, webpackX as webpack };

No type export for the options directly, and thewebpack export is any, preventing us to extract it's parameters.

[fi3ework]

Thanks for the PR! Let's see if we can keep the way of Storybook's official provided. I'll update later.

[fi3ework]

Failed, I can't find a better way to implement this better than this PR. Great job.

[fi3ework]

Thanks @guillaumewuip !