Add dark mode support

This commit checks out cgit.css from commit
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	From: Samuel Lidén Borell <samuel@kodafritt.se>
	Date: Sun, 29 Jan 2023 17:55:29 +0100
	Subject: css: Support for dark mode
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	Modern browsers have a "dark mode" preference, which enables alternate
	styles on web sites that support this.

	This patch adds a dark color scheme, that is automatically activated
	via a CSS @media query.

	Older browsers that do not support color schemes will simply show the
	light scheme, but possibly without syntax highlighting.

	Note that filters that use color (such as source highlighters) and
	logotypes may need to be updated to work with a black background!
	See the updated files in the filters/ directory.

	Signed-off-by: Samuel Lidén Borell <samuel@kodafritt.se>
	Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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