Simplify icon/logo generation with ImageMagick #1199

Job	Run time
lint (npm run lint:eslint, macos)	1m 11s
lint (npm run lint:eslint, ubuntu)	1m 16s
lint (npm run lint:eslint, windows)	1m 4s
lint (npm run lint:yaml, macos)	34s
pylint (macos)	14s
lint (npm run lint:yaml, ubuntu)	38s
pylint (ubuntu)	24s
lint (npm run lint:yaml, windows)	41s
todo-check	6s
lint (npm run lint:md, macos)	36s
pylint (windows)	1m 23s
lint (npm run lint:md, ubuntu)	48s
lint (npm run lint:md, windows)	33s
lint (npm run lint:md:relative-urls, macos)	33s
lint (npm run lint:md:relative-urls, ubuntu)	34s
lint (npm run lint:md:relative-urls, windows)	38s
lint (npm run lint:md:consistency, macos)	42s
lint (npm run lint:md:consistency, ubuntu)	32s
lint (npm run lint:md:consistency, windows)	33s
	13m 0s

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