fix missing ability to set docs.extractArgTypes for html framework

[ndelangen]

Issue: #18376

What I did

@yannbf and I found that in #17695 a feature was not migrated to the html renderer, that was migrated for the other frameworks:

export const argTypesEnhancers = [enhanceArgTypes];

...was essentially missing.

I've added it and tested editing preview.ts in the html-kichten-sink example.

Note that in order for this feature to work, a component property has to be set in the default export of the story, see:

storybook/code/lib/docs-tools/src/argTypes/enhanceArgTypes.ts

Line 14 in e3115fd

const extractedArgTypes = extractArgTypes && component ? extractArgTypes(component) : {};

[yannbf]

[yannbf]

Quick reminder to add documentation to the need of component to be set when using custom extractArgTypes.