Merge branch 'egor/contrast-in-code' into 'master'

Add contrast to code snippets

See merge request pleroma/docs!2

docs/css/extra.css

@@ -7,3 +7,8 @@
 {
  color: #ffab40;
 }
+
+code,
+.codehilite pre {
+  font-weight: bold;
+}