Add Tokyo Night theme #106

Job	Run time
Ensure 'cargo fmt' has been run	12s
Extract crate metadata	2s
Minimum supported rust version	2m 34s
aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 16s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 13s
arm-unknown-linux-musleabihf (ubuntu-20.04)	1m 15s
i686-pc-windows-msvc (windows-2019)	2m 1s
i686-unknown-linux-gnu (ubuntu-20.04)	1m 6s
i686-unknown-linux-musl (ubuntu-20.04)	1m 8s
x86_64-apple-darwin (macos-12)	1m 47s
x86_64-pc-windows-gnu (windows-2019)	2m 48s
x86_64-pc-windows-msvc (windows-2019)	1m 54s
x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 0s
x86_64-unknown-linux-musl (ubuntu-20.04)	1m 11s
	19m 27s

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