diff --git a/doc/_static/sliders.png b/doc/_static/sliders.png
new file mode 100644
index 0000000000..1c9a702b3f
Binary files /dev/null and b/doc/_static/sliders.png differ
diff --git a/doc/conf.py b/doc/conf.py
index 69fcdbf3ff..fe374d3963 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -69,7 +69,7 @@
     'deployment_url': 'https://panel-gallery.pyviz.demo.anaconda.com/'
 }
 
-_NAV =  (
+_NAV = (
     ('Getting started', 'getting_started/index'),
     ('User Guide', 'user_guide/index'),
     ('Gallery', 'gallery/index'),
@@ -88,7 +88,6 @@
     'VERSION': version,
     'WEBSITE_URL': 'https://panel.pyviz.org',
     'WEBSITE_SERVER': 'https://panel.pyviz.org',
-    'VERSION': version,
     'NAV': _NAV,
     'LINKS': _NAV,
     'SOCIAL': (
diff --git a/examples/user_guide/Django_Apps.ipynb b/examples/user_guide/Django_Apps.ipynb
index 7952f26958..435153620b 100644
--- a/examples/user_guide/Django_Apps.ipynb
+++ b/examples/user_guide/Django_Apps.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "As the core user guides including the [Introduction](Introduction.ipynb) have demonstrated, it is easy to display Panel apps in the notebook, launch them from an interactive Python prompt, and deploy them as a standalone Bokeh server app from the commandline. However, it is also often useful to embed a Panel app in large web application, such as a Django web server. Using Panel with Django requires a bit more work than for notebooks and Bokeh servers.\n",
+    "As the core user guides including the [Introduction](../getting_started/index.html) have demonstrated, it is easy to display Panel apps in the notebook, launch them from an interactive Python prompt, and deploy them as a standalone Bokeh server app from the commandline. However, it is also often useful to embed a Panel app in large web application, such as a Django web server. Using Panel with Django requires a bit more work than for notebooks and Bokeh servers.\n",
     "\n",
     "To run this example app yourself, you will first need to install django 2 (e.g. `conda install \"django=2\"`)."
    ]
@@ -34,7 +34,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "![screenshot of sliders app](../apps/django2/sliders.png)"
+    "![screenshot of sliders app](../_static/sliders.png)"
    ]
   },
   {
diff --git a/panel/util.py b/panel/util.py
index fe144ad07c..bdf835b797 100644
--- a/panel/util.py
+++ b/panel/util.py
@@ -12,9 +12,9 @@
 from datetime import datetime
 from six import string_types
 from collections import defaultdict, OrderedDict
-try:
+try:  # python >= 3.3
     from collections.abc import MutableSequence, MutableMapping
-except ImportError:  # support for python>3.8
+except ImportError:
     from collections import MutableSequence, MutableMapping
 
 import param