fix: remove legacy part from gitpod.yml

.gitpod.yml

@@ -76,22 +76,3 @@ ports:
     name: xdebug
     description: xdebug
     onOpen: ignore
-
-github:
-  prebuilds:
-    # enable for the master/default branch (defaults to true)
-    master: true
-    # enable for all branches in this repo (defaults to false)
-    branches: true
-    # enable for pull requests coming from this repo (defaults to true)
-    pullRequests: true
-    # enable for pull requests coming from forks (defaults to false)
-    pullRequestsFromForks: false
-    # add a check to pull requests (defaults to true)
-    addCheck: true
-    # add a "Review in Gitpod" button as a comment to pull requests (defaults to false)
-    addComment: false
-    # add a "Review in Gitpod" button to the pull request's description (defaults to false)
-    addBadge: true
-    # add a label once the prebuild is ready to pull requests (defaults to false)
-    addLabel: true