Hacks to use custom HTML template for Storybook

[lmorchard]

• Hacks in webpack.config.js to override the template file used for HTML generation in storybook

• Tweaked index.ejs with custom title and favicons

• Copied favicons over from Photon Design System

• Dropped client-side document.title hack from manager-head

• Add local copy of github-gist.min.css for code samples

[lmorchard]

GitHub Pages Deployment

Pull Request: https://FirefoxUX.github.io/photon-components-web/pull/61 Branch: https://FirefoxUX.github.io/photon-components-web/branches/use-custom-index-template Storybook: https://FirefoxUX.github.io/photon-components-web/commits/63433ec4691756f2ca587de6cde3d57f8a81ff12/ Build: https://FirefoxUX.github.io/photon-components-web/commits/63433ec4691756f2ca587de6cde3d57f8a81ff12/dist.zip

[lmorchard]

This is kind of ugly, because this part of storybook isn't easy to customize cleanly. But, it should let us specify EJS templates for the HTML.

Right now, there's just one template, but I can tweak this to use different templates for the overall management UI vs the story frame if we need to customize more specifically.

[lmorchard]

There's no particular urgency to this PR - just if it seems useful to have, we can do this. We can also close this and just keep the branch around until/unless we need it.

[meandavejustice]

This looks good to me, I'll merge, but feel free to revert if you feel necessary.