style and compatibility update

app/main/routes.py

@@ -40,6 +40,14 @@ def dashboard():
     )
 
 
+@bp.route('/manual')
+def manual():
+    return render_template(
+        'main/manual.html.j2',
+        title='Manual'
+    )
+
+
 @bp.route('/news')
 def news():
     return render_template(