Enhance(frontend): サーバー情報から公式タグの一覧を見れるように

[penginn-net]

What

/about に公式タグを追加

Why

Resolve #317

Additional info (optional)

Checklist

• コントリビューションガイドを読みました( Read the contribution guide)
• ローカル環境で動作しました(Test working in a local environment)
• (必要なら)CHANGELOG_YOJO.mdの更新((If needed) Update CHANGELOG_YOJO.md)
• (必要なら)テストの追加((If possible) Add tests)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 20.31%. Comparing base (16d25eb) to head (f56fc0a).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
packages/frontend/src/pages/about.vue	0.00%	8 Missing ⚠️
packages/frontend/src/pages/official-tags.vue	0.00%	7 Missing ⚠️
packages/frontend/src/ui/_common_/common.ts	0.00%	5 Missing ⚠️
...ackages/frontend/src/pages/admin/official-tags.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #357      +/-   ##
===========================================
- Coverage    20.32%   20.31%   -0.01%     
===========================================
  Files          782      782              
  Lines       116358   116377      +19     
  Branches      1085     1085              
===========================================
  Hits         23644    23644              
- Misses       92129    92148      +19     
  Partials       585      585              

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