[docs] Add "refine" demo to showcase

[omeraplak]

We added the finefoods demo we created using the refine framework and Material UI. We think it will inspire people who will use Material UI. Thank you

• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

No bundle size changes

Generated by 🚫 dangerJS against 62c9163

[samuelsycamore]

Very cool, looks great! Thanks for adding this @omeraplak!

[michaldudak]

Could you please run yarn prettier and commit the changes?

[omeraplak]

yarn prettier

Hey,
I ran it when I saw the warning, but there is no change :/

yarn prettier 
yarn run v1.22.10
$ node ./scripts/prettier.js
✨  Done in 1.02s.

[michaldudak]

This is the required diff:

--- a/docs/data/material/discover-more/showcase/appList.js
+++ b/docs/data/material/discover-more/showcase/appList.js
@@ -452,7 +452,8 @@ const appList = [
     description: 'A full-featured Admin panel app',
     image: 'refine-finefoods.jpg',
     link: 'https://example.mui.admin.refine.dev/',
-    source: 'https://github.com/pankod/refine/tree/next/examples/fineFoods/admin/mui',
+    source:
+      'https://github.com/pankod/refine/tree/next/examples/fineFoods/admin/mui',
     stars: 2415,
     dateAdded: '2022-06-21',
   },

For some reason, I can't commit to your branch. Please apply this diff and push the changes.

[omeraplak]

looks good now, thank you!