adds a FAQ, fixes #4

faq.md

@@ -0,0 +1,12 @@
+---
+title: FAQ
+layout: default
+permalink: "faq.html"
+parent: Overview
+---
+
+### Q: How do I get back the Helios IDE after I have closed it
+
+A: Evaluate the following in the JavaScript console:
+
+    require('amber/helpers').popupHelios()