検索構文の書き方を一部廃止

[marihachi]

What

検索構文においてtext 123 searchのようにボタン部分が[]で囲まれていない書き方を廃止する。
Related #122

Why

Additional info (optional)

関連するテストは削除しています。

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.40%. Comparing base (2648486) to head (4226fa5).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #168      +/-   ##
===========================================
- Coverage    97.59%   97.40%   -0.20%     
===========================================
  Files            7        7              
  Lines         1083     1080       -3     
  Branches       304      304              
===========================================
- Hits          1057     1052       -5     
- Misses          26       28       +2     

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