Prepare for v0.7.0 release #2423

Job	Run time
Build Benchmarks	26s
Build Examples	37s
Build [debug feature]	7s
Build Benchmarks (w/ yoga)	43s
MSRV Build [Rust 1.65]	55s
Clippy	38s
Documentation	21s
Test Fixture Formatting	8s
Rustfmt	13s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	59s
Test Suite [std + block)]	52s
Test Suite [default features]	56s
Test Suite [default except content_size]	53s
Test Suite [default + serde]	59s
Test Suite [std + flexbox]	52s
Test Suite [std + grid]	1m 0s
Test Suite [alloc + no algorithms]	1m 0s
Test Suite [std (no algorithms)]	54s
Test Suite [no features]	51s
	13m 27s

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