Add favicon files

[TJScalzo]

I've generated the files and placed them where they need to be. Since the README of the main repo says the Hugo Static Site Templating engine was used, I'm not going to directly edit any of the html files. You should add the following code to the head of every page on the site (probably using Hugo):

<link rel="apple-touch-icon" sizes="180x180" href="/favicons/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicons/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicons/favicon-16x16.png">
<link rel="manifest" href="/favicons/manifest.json">
<link rel="mask-icon" href="/favicons/safari-pinned-tab.svg" color="#000000">
<link rel="shortcut icon" href="/favicons/favicon.ico">
<meta name="msapplication-config" content="/favicons/browserconfig.xml">
<meta name="theme-color" content="#ffffff">

Let me know if there are any problems or questions.

This pertains to issue #4 on main repo.