feat(config): minify exampleSite HTML output

[jamesericdavidson]

Reduce exampleSite's HTML file size:

• Home page reduced by ~3.1k

• Emoji Support reduced by ~67k

• [x] advanced docs

N.B. The hosted version of exampleSite is not minified:

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[jamesericdavidson]

@yashmehrotra @526avijitgupta Little win here to grab more performance through minification.