[website] Add Marblism diamond sponsor

[rluzists1]

https://mui.zendesk.com/agent/tickets/17044

4 locations to check:

• https://github.com/rluzists1/material-ui/blob/marblism-diamond-sponsorship/README.md#diamond-
• https://deploy-preview-41097--material-ui.netlify.app/material-ui/discover-more/backers/
• https://deploy-preview-41097--material-ui.netlify.app/#sponsors

[mui-bot]

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• docs/data/material/discover-more/backers/backers.md

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[oliviertassinari]

@rluzists1 Please don't use @core, this notifies everyone and subscribe them to future notifications on this PR.

Instead, let's rely on the people responsible or accountable of https://www.notion.so/mui-org/Keep-sponsors-up-to-date-7ebff6991f2946ca853b0e1d3df3a826.

[danilo-leal]

Please don't use @ core, this notifies everyone.

Quick aside about this: I've added some brief review "etiquette" instructions (that can be enhanced/beefed up) on the Notion GitHub PRs page. I think we can help folks who aren't that familiar with GitHub by writing down more of these "how-to-use" guides about the tools we use! @rluzists1 I wouldn't be surprised if you have just learned about this little instruction now through trial and error, but maybe for future non-devs interacting with code, this can be handy! :)

[rluzists1]

I wouldn't be surprised if you have just learned about this little instruction now through trial and error, but maybe for future non-devs interacting with code, this can be handy! :)

Thanks @danilo-leal :) I'd used the @core for my career page PR so just assumed that was custom; agree having these how-tos is really helpful

[oliviertassinari]

I pushed a fix for a two-year-old bug: https://github.com/mui/material-ui/pull/33528#discussion_r928718156, and increased the pixel ratio to support mobile (usually x3) for the exiting sponsors.

I didn't touch the new one (maybe I should have done this in a separate PR). The image handling of Marblism needs to be fixed though:

• Missing dark mode
• Pixelized rendering

[rluzists1]

Applied the same changes to the marblism image on backers and READ.me

[oliviertassinari]

Good on my end. I polished the existing sponsors as much as I could

[rluzists1]

Still can't seem to get that readme to work, not sure what the issue is?

[brijeshb42]

@rluzists1 It won't work right now since the image you added only lives in your branch. Once your changes are merged to master and the docs site gets the updated code, it'll have the new image and your changes in README will also reflect the image.

[rluzists1]

Thank you @brijeshb42 that's really helpful, I'll stop stressing about it then!

In that case, all changes on my end are complete/look good; will wait for your review @danilo-leal before merging :)

[rluzists1]

Thanks for reviewing @danilo-leal and yes, we have in theory! I've removed other language that referenced it on the site (1/3 slots), although I haven't made changes to the parts of the code that reference it (const maxNumberOfDimaondSponsors = 3 in DiamondSponsors.txt) just yet. Will tackle this if/when we want to add a 4th diamond sponsor.

All good for me to click squash and merge then?