Improve DocFX documentation generation

Docs/templates/discordfx/styles/main.css

@@ -0,0 +1,21 @@
+.sidenav {
+  position: sticky;
+  top: 0;
+  max-height: 100vh;
+}
+
+.sidetoc {
+  height: 100vh;
+}
+
+.inheritedMembers,
+.extensionMethods {
+  display: none;
+}
+
+.content.wrap h1,
+.content.wrap h2,
+.content.wrap h3,
+.content.wrap h4 {
+  scroll-margin-top: 80px;
+}