Docs: update FAQ

Remove the section on "profiling" which was incomplete and not directly
linked to the code in this project. Also fix the headings so that
they're all of the same level.

Fix h5bpgh-1170

doc/faq.md

@@ -3,7 +3,7 @@ table of contents](README.md)
 
 # Frequently asked questions
 
-## Why is the URL for jQuery without "http"?
+### Why is the URL for jQuery without "http"?
 
 This is an intentional use of [protocol-relative
 URLs](http://paulirish.com/2010/the-protocol-relative-url/)
@@ -64,16 +64,6 @@ span.skype_pnh_print_container {
 ```
 
 
-### What is profiling, and how do I use it, why do I want it?
-
-[Firebug](http://michaelsync.net/2007/09/10/firebug-tutorial-logging-profiling-and-commandline-part-ii)
-and [Chrome Dev
-tools](http://code.google.com/chrome/devtools/docs/profiles.html) offer
-profiling, but there is no easy way to profile IE6 and IE7. If you're focused
-on providing the most responsive experience possible (you should be!) then
-profiling should be part of your development workflow.
-
-
 ### Do I need to upgrade my sites each time a new version of HTML5 Boilerplate is released?
 
 No. You don't normally replace the foundations of a house once it has been