Add a tutorial on rotating equivariants #497

Job	Run time
setup	10s
generate-example (rotate-equivariants)	3m 16s
generate-example (lode-linear)	3m 33s
generate-example (roy-gch)	3m 23s
generate-example (dos-align)	3m 32s
generate-example (lpr)	3m 26s
generate-example (batch-cp2k)	1m 50s
generate-example (gaas-map)	3m 33s
generate-example (pi-metad)	3m 31s
generate-example (sample-selection)	3m 36s
generate-example (thermostats)	3m 31s
generate-example (heat-capacity)	2m 23s
generate-example (periodic-hamiltonian)	3m 32s
generate-example (pi-mts-rpc)	3m 31s
generate-example (path-integrals)	1m 53s
build-and-publish	0s
	44m 40s

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