Migrate docs workflows from preview-build to docs-actions (#763)

Moves docs CI/CD from elastic/docs-builder to elastic/docs-actions.
Part of elastic/docs-eng-team#474

Author: Mpdreamz

.github/workflows/docs-build.yml

@@ -1,20 +1,13 @@
 name: docs-build
-
 on:
-  workflow_dispatch: ~
+  pull_request:
+    types: [opened, synchronize, reopened]
   push:
-    branches:
-      - master
-  pull_request_target: ~
+    branches: [master]
   merge_group: ~
-
+permissions:
+  contents: read
+  pull-requests: read
 jobs:
-  docs-preview:
-    uses: elastic/docs-builder/.github/workflows/preview-build.yml@main
-    with:
-      path-pattern: docs/**
-    permissions:
-      deployments: write
-      id-token: write
-      contents: read
-      pull-requests: write
+  build:
+    uses: elastic/docs-actions/.github/workflows/docs-build.yml@v1

.github/workflows/docs-cleanup.yml

@@ -0,0 +1,14 @@
+name: docs-deploy
+on:
+  workflow_run:
+    workflows: [docs-build]
+    types: [completed]
+permissions:
+  contents: read
+  deployments: write
+  id-token: write
+  pull-requests: write
+  actions: read
+jobs:
+  deploy:
+    uses: elastic/docs-actions/.github/workflows/docs-deploy.yml@v1

.github/workflows/docs-deploy.yml

@@ -0,0 +1,11 @@
+name: docs-preview-cleanup
+on:
+  pull_request_target:
+    types: [closed]
+permissions:
+  contents: none
+  deployments: write
+  id-token: write
+jobs:
+  cleanup:
+    uses: elastic/docs-actions/.github/workflows/docs-preview-cleanup.yml@v1