Fix #20: Highlight navbar item

Raymond Toy requested to merge issue-20-highlight-navbar-item into master

When we're on a particular page, highlight the navbar item to show that we're on that page (or subpage).

To do this, when the navbar iframe is loaded from the main frame, a query string is passed to the iframe indicating which item to highlight. The navbar iframe looks at the query string and finds the entry in the list and highlights that entry.

Currently, highlighting just means make the item bold with a slightly larger font.

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