feat: shadow feather icon set to append additional needed icons

src/@newrelic/gatsby-theme-newrelic/icons/feather.js

@@ -0,0 +1,24 @@
+import React from 'react';
+import defaultIcons from '@newrelic/gatsby-theme-newrelic/src/icons/feather';
+
+export default {
+  ...defaultIcons,
+  code: (
+    <>
+      <polyline points="16 18 22 12 16 6" />
+      <polyline points="8 6 2 12 8 18" />
+    </>
+  ),
+  eye: (
+    <>
+      <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z" />
+      <circle cx="12" cy="12" r="3" />
+    </>
+  ),
+  'message-square': (
+    <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z" />
+  ),
+  twitter: (
+    <path d="M23 3a10.9 10.9 0 0 1-3.14 1.53 4.48 4.48 0 0 0-7.86 3v1A10.66 10.66 0 0 1 3 4s-4 9 5 13a11.64 11.64 0 0 1-7 2c9 5 20 0 20-11.5a4.5 4.5 0 0 0-.08-.83A7.72 7.72 0 0 0 23 3z" />
+  ),
+};