Finish all_pages_sign_in example

examples/maqpy/all_pages_sign_in.py

@@ -0,0 +1,15 @@
+"""An example of the all_pages_sign_in() feature."""
+from replit import maqpy
+
+app = maqpy.App(__name__)
+app.all_pages_sign_in(exclude=["/"])
+
+
+@app.route("/")
+def index() -> str:
+    return "Some introduction " + maqpy.Link("check out my page", href="/page")
+
+
+@app.route("/page")
+def page() -> str:
+    return "Hello, if you are reading this you signed in."