[website] Add new sponsors to the homepage

[danilo-leal]

As requested via Zendesk: https://mui.zendesk.com/agent/tickets/20033

[mui-bot]

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

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[rluzists1]

all done! Fixed a small typo but otherwise, looks good to me

[oliviertassinari]

This feels like the same case as https://mui.zendesk.com/agent/tickets/19756

https://opencollective.com/mui-org

I don't think we can show them. It creates a minefield for real sponsors, e.g. I wouldn't want to sponsor https://vuetifyjs.com/ and be associated with (in the middle of) all of these sponsors. Reverted: 70b95a5.

Now, I would propose this way out, it can add $24k+/year, with minimal effort, everyone wins:

• The value for those organizations see is the backlinks. It's the opposite of what healthy sponsors want: the brand association, and supporting the team's work. So we can handle them differently.
• We hide their logos, only add their backlinks. A backlink to a DR 80 domain reputation for $6k/year seems correctly priced. I have tried to search for the SEO limits of doing this, but I couldn't really find any. It seems that it could grow to have a lot of those.

• In practice, it can look something like this:

Design to refine. Maybe it shouldn't even be a logo, I don't know, some comparison: https://fund.blender.org/#credits-titanium.

• We (@rluzists1) contact this sponsor back, see if this plan works for them. If it does, we move forward, if it doesn't we decline the sponsoring.
• We (@rluzists1) contact all the others we rejected and propose them this setup:
  • https://mui.zendesk.com/agent/tickets/19756
  • https://mui.zendesk.com/agent/tickets/16769
  • https://groups.google.com/a/mui.com/g/core/c/s7UOssuliWE/m/alTbKvllAAAJ

Thoughts?