Add coding standards overview page

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: I2dd0fb44a78da62864442fd633654a3e4f887184
diff --git a/docs/.vuepress/config.js b/docs/.vuepress/config.js
index e2e413d..987a846 100644
--- a/docs/.vuepress/config.js
+++ b/docs/.vuepress/config.js
@@ -28,6 +28,7 @@
           {
             title: "Coding Standards",
             children: [
+              ["/guide/coding-standards/", "Overview"],
               ["/guide/coding-standards/accessibility", "Accessibility"],
               ["/guide/coding-standards/sass", "SASS"],
               ["/guide/coding-standards/javascript", "JavaScript"]