Favicons

[ninjulia]

Fixes #53

• Moved favicon files into ./accouterments from public
• Moved 'server' files _headers, _redirects, && robots.txt into ./accouterments
• Added passthrough copy rules to add contents of ./accouterments to public on build
• Commented out currently unused passthrough rule { filter: (path) => path.endsWith('-h1.png') == false } will use a variation of this when I re-address the images plug-in

Moving these items to their own folder means I can 'nuke' the public folder if needed without worrying about losing this data. I considered merging the _headers && _redirects files into one netlify.toml but I think the toml syntax is ugly and those files worked as-is.

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