Minifiy HTML and CSS

[balloob]

Home Assistant 0.99

Right now we use terser for minification. Terser does not understand our html and css tags as used by Lit, and therefore leaves those pieces of code untouched.

If we would switch to babel-minify as our minifier we can use babel-plugin-template-html-minifier which is able to minify CSS and HTML.

This issue is not a prioritiy, just wanted to have it written up so we don't forget.

[balloob]

We should take inspiration from open-wc: https://github.com/open-wc/open-wc/blob/master/packages/building-rollup/modern-config.js#L61

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