fix: set page title

[y-young]

Fix #438

未完成的页面（比如维基编辑历史）还没接入数据，就先不改了

[github-actions]

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[trim21]

#473 这个呢（

[y-young]

#473 这个呢（

要不等这个合进去了那边再加？

[trim21]

#473 这个呢（

要不等这个合进去了那边再加？

那我 @FoundTheWOUT (

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 🎉

Comparison is base (20da6f7) 82.93% compared to head (c2260de) 83.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #512      +/-   ##
==========================================
+ Coverage   82.93%   83.02%   +0.08%     
==========================================
  Files          95       96       +1     
  Lines        5803     5832      +29     
  Branches      460      460              
==========================================
+ Hits         4813     4842      +29     
  Misses        983      983              
  Partials        7        7              

Impacted Files	Coverage Δ
packages/website/src/components/Helmet.tsx	100.00% <100.00%> (ø)
...bsite/src/pages/index/group/[name]/index/index.tsx	92.98% <100.00%> (+0.25%)	⬆️
...ite/src/pages/index/group/[name]/index/members.tsx	91.86% <100.00%> (+0.83%)	⬆️
packages/website/src/pages/login/index.tsx	95.03% <100.00%> (+0.14%)	⬆️
packages/website/src/utils/test-utils.tsx	100.00% <100.00%> (ø)

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[FoundTheWOUT]

那就先把这个合了？

[FoundTheWOUT]

话说，如果 Helmet 用了两次会怎样，就比方说在 layout 用了 Helmet，然后在 page 里又用了一次 Helmet

[y-young]

话说，如果 Helmet 用了两次会怎样，就比方说在 layout 用了 Helmet，然后在 page 里又用了一次 Helmet

Helmet 不能嵌套使用，如果平级的两个 Component 都用了 Helmet 会合并结果，如有相同的元素后者会覆盖前者：https://github.com/nfl/react-helmet#example