This adds a simple mechanism to view any template file directly in a browser. The intention is that we can use this to build up reference HTML files which illustrate common UX patterns. We can then view the resulting pages without having to have a working implementation.
In development mode, the URL is /template followed by the path to the template file. For example, you can view the 404 page at:
/template/404.html
You can also supply string parameters to the template by specifying them as query parameters in the URL.
e.g. /template/my_template?name=Foo
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