Redesign: new editorial design language, drop tailwind for UnoCSS #19

Job	Run time
leptosfmt --check	10s
cargo clippy	1m 22s
build	1m 38s
wasm-pack test (headless Firefox)	1m 59s
cargo test	31s
Line endings (LF only)	21s
cargo fmt --check	15s
	6m 16s

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