[website] Remove TikTokFame and Text-em-all as gold sponsors and Kombai as diamond sponsor

[rluzists1]

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

Remove TikTokFame and Text-em-all as gold sponsors in:

• README.md
• backers.md
• GoldSponsors.tsx

Remove Kombai as a diamond sponsor in:

• README.md
• backers.md
• DiamondSponsors.txt
• DiamondSponsors.js

Links to sponsorship cancellation:

• Spreadsheet for current sponsors 👉 https://docs.google.com/spreadsheets/d/1JYYhZN2JDaSXYsDYYyUSYU5pwtJf5hfoa8yJhHTL5ZU/edit?gid=2042920687#gid=2042920687&range=B13
• TikTokFame cancellation 👉 https://opencollective.com/mui-org/contributions/873795
• Text-Em-All cancellation 👉 https://opencollective.com/mui-org/contributions/6514
• Buzzoid cancellation 👉 https://dashboard.stripe.com/acct_1Ee8gJI4vHYTeDR2/subscriptions/sub_1S6VqII4vHYTeDR2fE1EFYDZ & https://app.frontapp.com/open/cnv_1axatv86

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Preview:

• homepage: https://deploy-preview-47182--material-ui.netlify.app/#sponsors
• docs: https://deploy-preview-47182--material-ui.netlify.app/material-ui/discover-more/backers/
• README: https://github.com/rluzists1/material-ui/tree/remove-sponsors?tab=readme-ov-file#sponsors

[mui-bot]

Netlify deploy preview

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

Bundle size report

Bundle	Parsed size	Gzip size
@mui/material	0B(0.00%)	0B(0.00%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

Details of bundle changes

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