Created by: georgevreilly
I discovered that <tt> is unstyled and so looks different from <code> and <pre>.
Using the Bootswatch Readable theme with Nikola, ReStructuredText inline literal markup (double backquotes fore and aft) is rendered using <tt>. Although <tt> is obsolete in HTML5, RST targets HTML4.1.
This pull request treats <tt> like <code>. It works in my snapshot of the Readable theme. I can't tell if any other changes are needed. I presume the change in normalize.css should be pushed to Normalize.