Move app installation note to base README #343

Job	Run time
build (rustjswasm, macos-latest)	7m 52s
build (rust, macos-latest)	5m 2s
build (cpp, ubuntu-latest)	1m 19s
build (cpp, macos-latest)	1m 6s
build (rust, ubuntu-latest)	5m 31s
build (js, ubuntu-latest)	57s
build (js, macos-latest)	59s
build (jupyter, macos-latest)	1m 48s
build (jupyter, ubuntu-latest)	1m 38s
build (rustjswasm, ubuntu-latest)	6m 26s
build (cppjswasm, ubuntu-latest)	2m 24s
build (python, macos-latest)	31s
build (cppjswasm, macos-latest)	2m 37s
build (python, ubuntu-latest)	15s
	38m 25s

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