feat: added initial version of png cover image to epub

sphinx/source/conf.py

@@ -90,4 +90,5 @@ latex_elements = {
 latex_logo = '_static/wtf_coop_header.png'
 latex_show_urls = 'footnote'
 
-epub_cover = ('_static/wtf_coop_header.png',  'epub-cover.html')
+epub_theme = 'wtf_epub'
+epub_cover = ('_static/epub_cover.png', 'epub-cover.html')

sphinx/theme/wtf_epub/epub-cover.html

@@ -0,0 +1,23 @@
+{#
+epub/epub-cover.html
+~~~~~~~~~~~~~~~~~~~~
+
+Sample template for the html cover page.
+
+:copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS.
+:license: BSD, see LICENSE for details.
+#}
+{%- extends "layout.html" %}
+{%- block header %}{% endblock %}
+{%- block rootrellink %}{% endblock %}
+{%- block relbaritems %}{% endblock %}
+{%- block sidebarlogo %}{% endblock %}
+{%- block linktags %}{% endblock %}
+{%- block relbar1 %}{% endblock %}
+{%- block sidebar1 %}{% endblock %}
+{%- block sidebar2 %}{% endblock %}
+{%- block footer %}{% endblock %}
+
+{% block content %}
+<div class="epub-cover" style="background-image: url('{{ image }}');"></div>
+{% endblock %}

sphinx/theme/wtf_epub/static/css/style.css

@@ -0,0 +1,9 @@
+.epub-cover {
+    margin: 0;
+    padding: 0;
+    width: 100%;
+    height: 100%;
+    background-size: contain;
+    background-repeat: no-repeat;
+    background-position: center;
+}

sphinx/theme/wtf_epub/theme.conf

@@ -0,0 +1,3 @@
+[theme]
+inherit = epub
+stylesheet = css/style.css