Add a simple theme

Because dark mode rulez :-) For lovers of white web, TODO has been
added.

TODO

@@ -9,3 +9,4 @@
 - [ ] Tags integration
 - [ ] Maybe categories?
 	- Probably categories would 
+- [ ] Add both variants of theme (light, dark)

test-theme/static/css/theme.css

@@ -0,0 +1,12 @@
+body {
+	background-color: #003;
+	color: #5bf;
+}
+
+a {
+	color: #8df;
+}
+
+h1, h2, h3, h4, h5, h6 {
+	font-family: sans-serif;
+}

test-theme/templates/base.html

@@ -21,6 +21,7 @@
 	{# TODO: More meta tags #}
 
 	{# CSS and other: #}
+	<link rel=stylesheet href="{{ THEME_STATIC_DIR }}/css/theme.css">
 
 	{# Title setting #}
 	{% if page_title %}