static: added clean-blog.css

Signed-off-by: rscnt <rascnt@gmail.com>

static/blog.ungleich.ch/less/mixins.less

@@ -0,0 +1,22 @@
+// Mixins
+
+.transition-all() {
+    -webkit-transition: all 0.5s;
+    -moz-transition: all 0.5s;
+    transition: all 0.5s;
+}
+
+.background-cover() {
+    -webkit-background-size: cover;
+    -moz-background-size: cover;
+    background-size: cover;
+    -o-background-size: cover;
+}
+
+.serif() {
+	font-family: 'Lora', 'Times New Roman', serif;
+}
+
+.sans-serif () {
+	font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+}