remove welcome bot config

.github/config.yml

@@ -1,11 +0,0 @@
-newIssueWelcomeComment: >
-  Hi there!
-  
-  Thanks a bunch for opening your first issue! :pray:
-  As you're new to this repo, we'd like to suggest that you read our [code of conduct](https://github.com/containrrr/watchtower/blob/master/CODE_OF_CONDUCT.md)
-  
-newPRWelcomeComment: >
-  Thanks for opening this pull request! Please check out our [contributing guidelines](https://github.com/containrrr/watchtower/blob/master/CONTRIBUTING.md) as well as our [code of conduct](https://github.com/containrrr/watchtower/blob/master/CODE_OF_CONDUCT.md).
-
-firstPRMergeComment: >
-  Congrats on merging your first pull request! We are all very proud of you! :sparkles: