add CSS for markdown TOC

Author: mathroc

source/_sass/all.scss

@@ -21,6 +21,7 @@
 @import "blocks/home_banner";
 @import "blocks/home_features";
 @import "blocks/markdown";
+@import "blocks/markdown_toc";
 @import "blocks/get_involved_links";
 @import "blocks/faqs";
 @import "blocks/bylaws";

source/_sass/blocks/markdown_toc.scss

@@ -0,0 +1,18 @@
+.markdown.sidebar_toc {
+    ol {
+        list-style-type: none;
+        margin-top: 0;
+
+        li {
+            margin: 0;
+        }
+    }
+
+    & > ol {
+        padding-left: 15px;
+    }
+
+    p {
+        margin-bottom: 0;
+    }
+}