get rid of workflow, use pre-commit hook instead

.github/workflows/main.yml

@@ -1,39 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches: [ master ]
-  workflow_dispatch:
-  schedule:
-    - cron: '45 * * * *'
-
-env:
-  WEBMENTION_TOKEN: ${{secrets.WEBMENTION_TOKEN}}
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Get yarn cache directory path
-        id: yarn-cache-dir-path
-        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
-
-      - uses: actions/cache@v2
-        id: yarn-cache
-        with:
-          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-yarn-
-
-      - name: yarn jamstack build
-        run: |
-          yarn install
-          yarn run jamstack
-
-      - name: commit generated hugo stuff
-        uses: stefanzweifel/git-auto-commit-action@v4
-        with:
-          commit_message: jamstack update metadata