Sphinx template override to link "View Source" to code repository

layout.html

<!--
  1. Place this to _templates/layout.html
  2. Edit source_url_prefix below to point to your repo

	Overriding Alabaster Theme to replace link to static page source
	with a link to GitHub. Using instructions from official guide.
	https://www.sphinx-doc.org/en/master/templating.html#jinja-sphinx-templating-primer
-->
{% set source_url_prefix = 'https://github.com/bitprophet/alabaster/tree/master/docs' %}

{% extends "!layout.html" %}
{%- block footer %}
    <div class="footer" style="text-align: center">
      &copy;{{ copyright }}.|
      Powered by <a href="http://sphinx-doc.org/">Sphinx {{ sphinx_version }}</a>
      &amp; <a href="https://github.com/bitprophet/alabaster">Alabaster {{ alabaster_version }}</a>
      (<a href="{{ source_url_prefix }}/_templates">customized</a>)
      |
      <a href="{{ source_url_prefix }}{{ pagename + ".rst"|e }}"
          rel="nofollow">{{ _('View source') }}</a>
    </div>
{%- endblock %}