[eas-cli] Refresh README

[szdziedzic]

Summary

• rewrite the EAS CLI README top section as a product-focused landing page
• add the EAS logo asset and centered badge/link treatment
• keep the generated command reference intact and make the README patch script reapply the custom header

Validation

• ./node_modules/.bin/oxfmt packages/eas-cli/README.md packages/eas-cli/scripts/patch-readme.js packages/eas-cli/scripts/readme-header.md .github/resources/eas.svg
• node scripts/patch-readme.js
• git diff --check
• git diff --check --cached

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.26%. Comparing base (80baa13) to head (0a13d4b).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3844      +/-   ##
==========================================
+ Coverage   58.13%   58.26%   +0.13%     
==========================================
  Files         917      917              
  Lines       39772    39827      +55     
  Branches     8330     8350      +20     
==========================================
+ Hits        23119    23200      +81     
+ Misses      15211    15193      -18     
+ Partials     1442     1434       -8     

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[github-actions]

❌ It looks like a changelog entry is missing for this PR. Add it manually to CHANGELOG.md.
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