Revert "Update Antora Plugin to 1.0.0"

This reverts commit 280f311677.

.github/workflows/deploy-reference.yml

@@ -0,0 +1,33 @@
+name: Build & Deploy Reference
+
+on:
+  repository_dispatch:
+    types: request-build-reference
+  schedule:
+    - cron: '0 10 * * *' # Once per day at 10am UTC
+  workflow_dispatch: # Manual trigger
+
+jobs:
+  deploy:
+    name: deploy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          cache: gradle
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
+      - name: Build with Gradle
+        run: ./gradlew :spring-session-docs:antora --stacktrace
+      - name: Cleanup Gradle Cache
+        # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
+        # Restoring these files from a GitHub Actions cache might cause problems for future builds.
+        run: |
+          rm -f ~/.gradle/caches/modules-2/modules-2.lock
+          rm -f ~/.gradle/caches/modules-2/gc.properties
+      - name: Deploy
+        run: ${GITHUB_WORKSPACE}/.github/actions/algolia-deploy.sh "${{ secrets.DOCS_USERNAME }}@${{ secrets.DOCS_HOST }}" "/opt/www/domains/spring.io/docs/htdocs/spring-session/reference/" "${{ secrets.DOCS_SSH_KEY }}" "${{ secrets.DOCS_SSH_HOST_KEY }}"