Extract example for static sites from single page applications example

[thomasturrell]

Issue #, if available: n/a

Description of changes: Static sites and single page web applications typically have different requirements. Static sites tend to have have an index.html file for each folder where as single page applications only have a single index.html in the root. Single page application typically use a client router to handle the routes.

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[thomasturrell]

I believe that the duplication in the test is a pragmatic solution because there are links to the existing files. Ideally the structure would be changes so that there was only one set of tests.

@dbrown-git I would appreciate your thoughts. I am happy to further explain my rational for this pull request if it is not clear.