refactor: delete trello-github plugin

Signed-off-by: Meng JiaFeng <[email protected]>

Author: steinliber

docs/plugins/plugins-list.md

@@ -2,7 +2,7 @@
 
 | Type                           | Plugin                      | Note                           | Usage/Doc                             |
 |--------------------------------|-----------------------------|--------------------------------|---------------------------------------|
-| Issue Tracking                 | trello                      | Trello Configuration                         | [doc](trello.md)                      |
+| Issue Tracking                 | trello                      | Trello Configuration           | [doc](trello.md)                      |
 | Issue Tracking                 | jira-github-integ           | Jira/GitHub integration        | [doc](jira-github-integ.md)           |
 | Issue Tracking                 | zentao                      | Zentao installation            | [doc](zentao.md)                      |
 | Source Code Management         | repo-scaffolding            | App scaffolding                | [doc](repo-scaffolding.md)            |