Fix nbconvert template (#939)

https://b.corp.google.com/issues/178057839

Author: Philmod

Dockerfile

@@ -6,6 +6,7 @@ FROM gcr.io/deeplearning-platform-release/base-cpu:${BASE_TAG}
 
 ADD clean-layer.sh  /tmp/clean-layer.sh
 ADD patches/nbconvert-extensions.tpl /opt/kaggle/nbconvert-extensions.tpl
+ADD patches/template_conf.json /opt/kaggle/conf.json
 
 # This is necessary for apt to access HTTPS sources
 RUN apt-get update && \

patches/nbconvert-extensions.tpl

@@ -4,7 +4,7 @@ All cell metadata starting with '_kg_' will be included with its value ({key}-{v
 as a class in the cell's DIV container
 #}
 
-{% extends 'full.tpl'%}
+{% extends 'classic/index.html.j2'%}
 {% block any_cell %}
     <div class="{% for k in cell['metadata'] if k.startswith("_kg_") %}{{k}}-{{cell['metadata'][k] | lower}} {% endfor %}">
         {{ super() }}

patches/template_conf.json

@@ -0,0 +1,13 @@
+{
+    "base_template": "classic",
+    "mimetypes": {
+        "text/html": true
+    },
+    "preprocessors": {
+        "100-pygments": {
+            "type": "nbconvert.preprocessors.CSSHTMLHeaderPreprocessor",
+            "enabled": true,
+            "style": "default"
+        }
+    }
+}