more favicons

[pi0]

As suggested in #42 (Thanks to @pimlie), We may add better per-browser-specific favicon support for both Meta and Icon modules. This enhancement includes:

• Checking realFaviconGenerator.net options and comparing with our implementations
• Review https://github.com/audreyr/favicon-cheat-sheet

This Issue is (for now) unassigned but planned. Any contribution and comments are welcome. The only condition is that using a remote API / Webservice is not currently an option and using NPM packages for doing that locally is preferred.

_{This feature request is available on Nuxt.js community (#c26)}