👷 Add pull request labelling workflow

.github/labeller.yml

@@ -0,0 +1,5 @@
+i18n:
+  - i18n/*
+
+documentation:
+  - exampleSite/content/*

.github/workflows/label.yml

@@ -0,0 +1,17 @@
+name: Labeller
+
+on: [pull_request]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+
+    steps:
+      - name: Label
+        uses: actions/labeler@v2
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          configuration-path: .github/labeller.yml