Add "Usage with TypeScript" section to the docs

[phryneas]

I believe this should cover most of the "usage with TS" stuff (including the changes from #262).

But writing docs is not my strong suit, so I'm looking for feedback :)

Closes #264

[netlify]

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Sandbox	Source
sharp-curie-iccik	Configuration
epic-platform-xblxs	Configuration
rsk-github-issues-example	Configuration
RTK-TS-Documentation	Issue #264

[phryneas]

On a sidenote, @markerikson - the generated netlify urls still say "redux-starter-kit" :D

[markerikson]

Looks fairly good overall. Nitpicks are mostly grammar, casing, formatting.

[markerikson]

@phryneas : yeah, I know :) that's because the actual Netlify site name is redux-starter-kit-docs.netlify.com, and both DNS entries point to that. It could be changed, but we'd have to do more coordinating with the js.org folks, and it's really not worth the effort at this point.

[markerikson]

Format it with Prettier, that's causing the CI failures.

[phryneas]

Argh xD
I just disabled prettier because I was reviewing a project written without prettier. I thought I did so on project-level :D

[phryneas]

Okay, I think I got all your comments. Thanks for the thorough review!

[markerikson]

Great, thanks!

Per my comment in #262 , can you go ahead and add a bit of info to the createReducer and createSlice docs to cover the builder API?

[le0nik]

It's builder.add in docs, but builder.addCase in code and builder types. Which one should be used?

[markerikson]

@le0nik: whatever the code says :) can you file a PR to fix the docs?

[le0nik]

@markerikson done #269