Paths to assets are incorrect in root-level HTML files

[damienmckenna]

By default the paths used for the assets are incorrect in root-level HTML files.

For example, the index.html file has this:
<link rel="stylesheet" href="/assets/toolkit/styles/toolkit.css">

.. whereas a file in a subdirectory will have this:
<link rel="stylesheet" href="../assets/toolkit/styles/toolkit.css">

If the files are load from a path where the "dist" directory is not at the top level of the web host, this results in the HTML files at the top level not working correctly whereas HTML files in directories do work correctly.

This could be resolved by using . for all files generated in the top directory.