fix: properly index <h2> sections

ref: https://github.com/wotakumoe/wotaku/pull/86

.github/workflows/labeler.yml

@@ -1,17 +0,0 @@
-name: 'Pull Request Housekeeping'
-
-on: [pull_request_target]
-
-jobs:
-  triage:
-    permissions:
-      contents: read
-      pull-requests: write
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v3
-      - name: Label PRs
-        uses: actions/labeler@v4
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}