remove labeller action (#153)

* remove labeller action

.github/workflows/label-prs.yml

@@ -1,22 +0,0 @@
-name: label PRs
-
-on:
-  pull_request:
-    paths:
-    - 'website/data/*'
-
-  workflow_dispatch:
-
-jobs:
-  add-labels:
-    runs-on: ubuntu-latest
-    steps:
-
-    - uses: actions/checkout@v2
-
-    - uses: christianvuerings/add-labels@v1
-      with:
-        labels: |
-          data
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}