[docs] Add "Overview" page to Base docs

[samuelsycamore]

This PR is in response to issue #32275, adding an Overview page to the Base docs.

https://deploy-preview-32310--material-ui.netlify.app/base/getting-started/overview/

The purpose of this page is to introduce the user to Base and briefly explain why they'd want to use it over Material UI, since I assume the vast majority of users will be familiar with Material UI if they're interested in Base.

This PR can also serve as a first step towards building out a marketing page for Base (in a future PR). Here we can start to formulate the language we want to use to describe Base as a product.

I think this page should be the default landing page for the Base docs, but I'm not sure how to make that happen. 😅

This is my first attempt to add a new page, so I apologize if I missed some piece of the puzzle!

Is there anything else about Base that we should mention in this doc?

It's kind of dry as just a big block of text. Some kind of screenshot would be nice, but that might not make sense for a product that's all about being style-free. 😛

It also feels like it doesn't "lead" anywhere. Maybe the end of the doc should direct the reader to move on to the installation page?

[mui-bot]

Details of bundle changes

@material-ui/core: parsed: +Infinity% , gzip: +Infinity%
@material-ui/lab: parsed: +Infinity% , gzip: +Infinity%
@material-ui/styles: parsed: +Infinity% , gzip: +Infinity%
@material-ui/private-theming: parsed: +Infinity% , gzip: +Infinity%
@material-ui/system: parsed: +Infinity% , gzip: +Infinity%
@material-ui/unstyled: parsed: +Infinity% , gzip: +Infinity%
@material-ui/utils: parsed: +Infinity% , gzip: +Infinity%
@mui/material-next: parsed: +Infinity% , gzip: +Infinity%
@mui/joy: parsed: +Infinity% , gzip: +Infinity%

Generated by 🚫 dangerJS against 504e129

[danilo-leal]

🎉

[samuelsycamore]

Should we add a note to the page to let folks know that Base in currently in alpha? That would also give us another excuse to ask for contributions :)

[mnajdova]

Should we add a note to the page to let folks know that Base in currently in alpha? That would also give us another excuse to ask for contributions :)

Yes please :)

[michaldudak]

I like it! It is a gentle introduction to the Base library.

FYI, some time ago I created a page in Material UI docs called Unstyled components. It doesn't belong to Material anymore and we should move it. There are more in-depth parts there (such as the anatomy of a component), so it could live as a separate page in Base docs. Please take a look if maybe some of the content (like use cases) could be appropriate for the page you created.

[samuelsycamore]

Thanks for the heads up @michaldudak! There's a lot of useful content there. I think we should move it over to the Base "Getting Started" docs and maybe split up the content into a couple of separate pages. I'll create a new PR for that.