Build sample material

add OnceCell to shared-mutability + splitting burrows speaker notes #999

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Job	Run time
build-examples-ferrocene	1m 38s
build-examples	1m 9s
build-slides	30s
build-slides-weekly-nightly	0s
build-slides-weekly-beta	0s
build-windows-examples	1m 9s
	4m 26s