[ci skip] RIP mentionbot (#3686)

https://github.com/facebookarchive/mention-bot/issues/230

No longer being maintained.

.mention-bot

@@ -1,23 +0,0 @@
-{
-  "maxReviewers": 10,
-  "numFilesToCheck": 100,
-  "message": "Thanks @pullRequester for contributing to The Framework Benchmarks! @reviewers, code you've worked on has been modified. If you have the chance, please review. If you wish to unsubscribe from these notices, please open a Pull Request with the commit message `[ci skip]` and your github name added to the userBlacklist array in the `.mention-bot` file.",
-  "alwaysNotifyForPaths": [
-    {
-      "name": "TechEmpower",
-      "files": ["*"],
-      "skipTeamPrs": false
-    }
-  ],
-  "fileBlacklist": [".travis.yml"],
-  "userBlacklist": ["hamiltont", "MalcolmEvershed"],
-  "userBlacklistForPR": [],
-  "actions": ["opened"],
-  "skipAlreadyAssignedPR": false,
-  "skipAlreadyMentionedPR": false,
-  "assignToReviewer": false,
-  "createReviewRequest": false,
-  "skipTitle": "review-skip",
-  "delayed": false,
-  "skipCollaboratorPR": false
-}