chore(docs): enhance api reference with styles for providers

[halvaradop]

☕️ Reasoning

This pull request introduces global styles for the providers API reference to ensure consistent background and text colors for the main description, while preventing users from inputting arbitrary colors that could disrupt the website's uniformity; the following images illustrate the implemented changes.

Screenshots

Before

After

there are some suppliers that establish these properties

🧢 Checklist

• [x] Documentation
• [x] Tests
• [ ] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 28, 2024 7:09pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
next-auth-docs	⬜️ Ignored (Inspect)	Visit Preview		Oct 28, 2024 7:09pm

[vercel[bot]]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 86 lines in your changes missing coverage. Please review.

Project coverage is 60.42%. Comparing base (ad15137) to head (35308de).

Files with missing lines	Patch %	Lines
packages/core/src/providers/42-school.ts	0.00%	1 Missing :warning:
packages/core/src/providers/apple.ts	0.00%	1 Missing :warning:
packages/core/src/providers/asgardeo.ts	0.00%	1 Missing :warning:
packages/core/src/providers/auth0.ts	0.00%	1 Missing :warning:
packages/core/src/providers/authentik.ts	0.00%	1 Missing :warning:
packages/core/src/providers/azure-ad-b2c.ts	0.00%	1 Missing :warning:
packages/core/src/providers/azure-ad.ts	0.00%	1 Missing :warning:
packages/core/src/providers/bankid-no.ts	0.00%	1 Missing :warning:
packages/core/src/providers/battlenet.ts	0.00%	1 Missing :warning:
packages/core/src/providers/beyondidentity.ts	0.00%	1 Missing :warning:
... and 76 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #11961       +/-   ##
===========================================
+ Coverage   39.05%   60.42%   +21.36%     
===========================================
  Files         191      136       -55     
  Lines       29994     6385    -23609     
  Branches     1294      532      -762     
===========================================
- Hits        11715     3858     -7857     
+ Misses      18279     2527    -15752     

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