added github actions

.github/workflows/check-docs.yml

@@ -0,0 +1,23 @@
+name: Fern Check
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./docs
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Fern
+        run: npm install -g fern-api
+
+      - name: Check API is valid
+        run: fern check

.github/workflows/preview-docs.yml

@@ -0,0 +1,33 @@
+name: Preview Docs
+
+on: pull_request
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    permissions: write-all
+    defaults:
+      run:
+        working-directory: ./docs
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Fern
+        run: npm install -g fern-api
+
+      - name: Generate preview URL
+        id: generate-docs
+        env:
+          FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
+        run: |
+          OUTPUT=$(fern generate --docs --preview 2>&1) || true
+          echo "$OUTPUT"
+          URL=$(echo "$OUTPUT" | grep -oP 'Published docs to \K.*(?= \()')
+          echo "Preview URL: $URL"
+          echo "🌿 Preview your docs: $URL" > preview_url.txt
+
+      - name: Comment URL in PR
+        uses: thollander/actions-comment-pull-request@v2.4.3
+        with:
+          filePath: preview_url.txt

.github/workflows/publish-docs.yml

@@ -0,0 +1,25 @@
+name: Publish Docs
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name == 'push' && contains(github.ref, 'refs/heads/main') && github.run_number > 1 }}
+    defaults:
+      run:
+        working-directory: ./docs
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Fern
+        run: npm install -g fern-api
+
+      - name: Publish Docs
+        env:
+          FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
+        run: fern generate --docs --log-level debug

docs/fern/docs.yml

@@ -1,5 +1,6 @@
 instances:
   - url: https://stack-auth.docs.buildwithfern.com
+    custom-domain: docs.stack-auth.com
 title: Stack Auth Documentation
 
 tabs:

docs/fern/docs/pages/getting-started/users.mdx

@@ -25,7 +25,7 @@ Because it's so common, `useUser()` is also exposed as a standalone hook. This m
 
 On Server Components, you don't need `useStackApp()`. Instead, you can just import the `StackServerApp` that you created in the previous chapter:
 
-```tsx focus={5-6} title="Server user profile"
+```tsx focus={4-5} title="Server user profile"
 import { stackServerApp } from "@/stack";
 
 export default async function MyComponent() {