Add a tutorial on rotating equivariants #510

Job	Run time
setup	3s
generate-example (rotate-equivariants)	3m 15s
generate-example (lode-linear)	3m 29s
generate-example (roy-gch)	3m 24s
generate-example (dos-align)	5m 28s
generate-example (lpr)	3m 16s
generate-example (batch-cp2k)	1m 53s
generate-example (gaas-map)	4m 16s
generate-example (pi-metad)	4m 24s
generate-example (sample-selection)	3m 27s
generate-example (thermostats)	3m 4s
generate-example (heat-capacity)	2m 31s
generate-example (periodic-hamiltonian)	5m 11s
generate-example (pi-mts-rpc)	5m 25s
generate-example (path-integrals)	2m 4s
build-and-publish	0s
	51m 10s

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