fix: infer providers logo filename

[ndom91]

☕️ Reasoning

• Infer provider logo filenames ([providerId].svg) from our docs domain
• Set sane defaults

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

📌 Resources

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

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3 Ignored Deployments

Name	Status	Preview	Updated (UTC)
auth-docs	⬜️ Ignored (Inspect)		Apr 6, 2024 8:25pm
next-auth-docs	⬜️ Ignored (Inspect)		Apr 6, 2024 8:25pm
nextra-docs	⬜️ Ignored (Inspect)		Apr 6, 2024 8:25pm

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 39.51%. Comparing base (41295db) to head (cb019e5).
Report is 4 commits behind head on main.

Files	Patch %	Lines
packages/core/src/lib/pages/signin.tsx	44.44%	10 Missing ⚠️
packages/core/src/providers/zoom.ts	0.00%	4 Missing ⚠️
packages/core/src/providers/vk.ts	0.00%	3 Missing ⚠️
packages/core/src/providers/okta.ts	0.00%	2 Missing ⚠️
packages/core/src/providers/atlassian.ts	0.00%	1 Missing ⚠️
packages/core/src/providers/azure-ad-b2c.ts	0.00%	1 Missing ⚠️
packages/core/src/providers/azure-ad.ts	0.00%	1 Missing ⚠️
packages/core/src/providers/battlenet.ts	0.00%	1 Missing ⚠️
packages/core/src/providers/cognito.ts	0.00%	1 Missing ⚠️
packages/core/src/providers/discord.ts	0.00%	1 Missing ⚠️
... and 20 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10496      +/-   ##
==========================================
+ Coverage   39.48%   39.51%   +0.03%     
==========================================
  Files         171      171              
  Lines       27324    27318       -6     
  Branches     1164     1167       +3     
==========================================
+ Hits        10789    10795       +6     
+ Misses      16535    16523      -12     

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