Add Netlify link to footer

In order to qualify for the Netlify open source plan, put link to Netlify in the footer.

Author: JoelMarcey

src/_templates/footer.html

@@ -0,0 +1,5 @@
+{% extends '!footer.html' %}
+
+{% block extrafooter %}
+        This site is powered through <a href="https://www.netlify.com">Netlify</a>.
+{% endblock %}

src/conf.py

@@ -111,7 +111,7 @@
     dict(name="maintainability", description="Maintainability-related guideline"),
     dict(name="portability", description="Portability-related guideline"),
     dict(name="surprising-behavior", description="Guideline related to surprising or unexpected behavior"),
-    
+
     dict(name="subset", description="Guideline associated with the language-subset profile"),
     dict(name="defect", description="Guideline associated with the defect-prevention profile"),
 ]
@@ -201,3 +201,4 @@
 # Configure the theme
 html_theme = "sphinx_rtd_theme"
 html_static_path = ["_static"]
+templates_path = ['_templates']