特定のサーバー向け機能を追加

[shiosyakeyakini-info]

• GitHubから情報を取得する
• カスタムエンドポイント機能 (Fix ぶいみみリレー参加インスタンスのVRTL,VSTLをタブ表示できるようにして欲しい #611 )
• APIキーが支援者などに制限されているサーバーでの、ログイン時のメッセージ表示

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.73%. Comparing base (8512cea) to head (aaedc67).
Report is 1 commits behind head on develop.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #672   +/-   ##
========================================
  Coverage    27.73%   27.73%           
========================================
  Files          312      312           
  Lines        16296    16296           
========================================
  Hits          4520     4520           
  Misses       11776    11776           

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