Revert "include support for `theme` option" #59

Job	Run time
build (ubuntu-latest, 25.3, false)	37s
build (ubuntu-latest, 26.3, false)	34s
build (ubuntu-latest, 27.2, false)	45s
build (ubuntu-latest, 28.2, false)	38s
build (ubuntu-latest, 29.4, false)	53s
build (macos-latest, 25.3, false)	34s
build (macos-latest, 26.3, false)	34s
build (macos-latest, 27.2, false)	42s
build (macos-latest, 28.2, false)	38s
build (macos-latest, 29.4, false)	51s
build (windows-latest, 25.3, false)	34s
build (windows-latest, 26.3, false)	34s
build (windows-latest, 27.2, false)	40s
build (windows-latest, 28.2, false)	38s
build (windows-latest, 29.4, false)	1m 9s
build (ubuntu-latest, snapshot, true)	37s
build (macos-latest, snapshot, true)	37s
build (windows-latest, snapshot, true)	35s
	12m 10s

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