Clean up unused workflows

We continuously deploy to https://compound.element.io using Cloudflare Pages, so we don't need to deploy to GitHub Pages as well. However, the workflow that did that was still useful for verifying that this actually builds, so I've kept that part.

Also, we don't release anything here to NPM.

.github/workflows/automation.yaml

@@ -0,0 +1,19 @@
+name: Automation
+on:
+  pull_request: {}
+  push:
+    branches: [main]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
+      - name: Set up cache
+        uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b # v4
+        with:
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+      - name: Build
+        run: yarn run build-storybook