Default Miru index.html

Miru couldn't find a index.html lookalike inside --path to serve.
Miru also creates a miru-connect.js file inside the --path directory to initialize live reloads, injection and error printing on the browser.
Add it as a script tag to your own index.html pages to initialize miru.

<script src="miru-connect.js" type="text/javascript"></script>
Consider adding miru-connect.js to your .gitignore since it's only for development.