fix(docs): update information about eslint-plugin-jsx-a11y functionality

[madalynrose]

Description

update docs/making-your-site-accessible to include information about default settings for eslint-plugin-jsx-a11y and update docs/eslint to clarify how local .eslintrc files are treated in Gatsby

Related PRs

#19946

[madalynrose]

@marcysutton is it ok to just remove the stuff about customization? It looks like if they implement rule customizations in their own .eslintrc file it will only show warnings and errors in IDE plugins and bypass the console entirely, which gets away from what we're trying to achieve by including all of the rules by default.

[marcysutton]

@madalynrose we can do whatever we want with this, but I'll pose this question: how would a user disable a rule that doesn't apply to their situation, i.e. causing false positives that end up being ignored? Can we update the config documentation to work better with the new changes, so they can customize what goes into the console? I know from my own experience that some of the warnings aren't always relevant.

[madalynrose]

re: customizing eslint

having a local .eslintrc overrides all default linting and bypasses Gatsby's eslint-loader by design. I will add a note about this and update our eslint doc to be more clear about this.

[laurieontech]

This write up is overall super helpful! Added one request for clarification.

[bball07]

This looks great! Awesome job Madalyn! Once this last change gets added this should be good to merge!!

[marcysutton]

This looks good to me, the only thing I noticed was needing to move a comma!

[laurieontech]

Wahoo! Psyched to get this in.