Removed auto-labeller for PRs

- this was an early attempt to group PRs together by labels, so we can
  triage PRs easier, but it's not finished and actually producing more
  noise than signal
- we might want to re-add this in the future, but for now, silence 🧘

.github/labeler.yml

@@ -1,7 +0,0 @@
-'affects:i18n':
-  - 'ghost/i18n/**'
-'affects:admin':
-  - 'ghost/admin/**'
-  - 'apps/admin-x-*/**'
-'affects:portal':
-  - 'apps/portal/**'

.github/workflows/labeler.yml

@@ -1,11 +0,0 @@
-name: PR labeler
-on:
-  - pull_request_target
-jobs:
-  triage:
-    permissions:
-      contents: read
-      pull-requests: write
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/labeler@v4