docs: Add blog post resource for building browser extensions

[rxliuli]

Overview

ref: #2065 (comment)

Manual Testing

Related Issue

This PR closes #<issue_number>

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@wxt-dev/unocss

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commit: 72bfc33

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.06%. Comparing base (088a444) to head (72bfc33).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2077      +/-   ##
==========================================
+ Coverage   75.90%   76.06%   +0.16%     
==========================================
  Files         113      113              
  Lines        3050     3050              
  Branches      686      686              
==========================================
+ Hits         2315     2320       +5     
+ Misses        651      647       -4     
+ Partials       84       83       -1     

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