chore: remove opencollective sponsors from the root readme

[bradzacher]

PR Checklist

• Addresses an existing open issue: ref Docs: Clear policy for what would preclude a sponsor from being featured on the website #5504
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

We have a website which is the primary port-of-call for users - we don't want people to be drawn to our github readme.
We also display financial contributors on our website, and we do so with our own logic.
The images deleted here are generated and controlled using OC's private, internal logic - meaning we're vulnerable to bad actors that we don't want to give publicity to.

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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🙏 Please, if you or your company is finding typescript-eslint valuable, help us sustain the project by sponsoring it transparently on https://opencollective.com/typescript-eslint. As a thank you, your profile/company logo will be added to our main README which receives thousands of unique visitors per day.

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✅ Successfully ran 47 targets

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[codecov]

Codecov Report

Merging #5506 (69a9e2e) into main (2fe40c1) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5506      +/-   ##
==========================================
- Coverage   91.70%   91.57%   -0.13%     
==========================================
  Files         366      132     -234     
  Lines       12345     1496   -10849     
  Branches     3603      226    -3377     
==========================================
- Hits        11321     1370    -9951     
+ Misses        671       62     -609     
+ Partials      353       64     -289     

Flag	Coverage Δ
unittest	91.57% <ø> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...es/eslint-plugin/src/rules/no-duplicate-imports.ts
...t-plugin/src/rules/class-literal-property-style.ts
packages/utils/src/ts-eslint-scope/Scope.ts
packages/utils/src/eslint-utils/deepMerge.ts
...t-plugin/src/rules/prefer-reduce-type-parameter.ts
packages/utils/src/ts-eslint/Scope.ts
...plugin/src/rules/naming-convention-utils/format.ts
...kages/eslint-plugin/src/rules/no-empty-function.ts
packages/typescript-estree/src/node-utils.ts
...ackages/eslint-plugin/src/rules/no-for-in-array.ts
... and 224 more

[JoshuaKGoldberg]

🤑