chore: update iconfont page resources

[erha19]

Types

• 🧹 Chores

Background or solution

升级构建依赖 offline-iconfont, 感谢 @vagusX 支持 vagusX/offline-iconfont#3.

自动化 Iconfont Page 部署及构建逻辑

增加 index.html 重定向文件，保障原有访问路径可用

Changelog

[codecov]

Codecov Report

Base: 57.61% // Head: 57.61% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (3c78638) compared to base (16f47dc).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1950      +/-   ##
==========================================
- Coverage   57.61%   57.61%   -0.01%     
==========================================
  Files        1286     1286              
  Lines       80534    80534              
  Branches    16855    16855              
==========================================
- Hits        46401    46397       -4     
- Misses      31048    31051       +3     
- Partials     3085     3086       +1     

Flag	Coverage Δ
jsdom	52.36% <ø> (-0.01%)	⬇️
node	15.88% <ø> (ø)

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

Impacted Files	Coverage Δ
packages/monaco/src/browser/schema-registry.ts	68.88% <0.00%> (-2.23%)	⬇️
...erences/src/browser/preference-settings.service.ts	75.00% <0.00%> (-0.63%)	⬇️
...kages/theme/src/browser/workbench.theme.service.ts	71.38% <0.00%> (-0.58%)	⬇️

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