Create .readthedocs.yaml #870

Job	Run time
build (ubuntu-latest, none)	8m 41s
build (ubuntu-latest, rtk)	30m 39s
build (ubuntu-latest, torch)	9m 34s
build (ubuntu-latest, optic)	8m 35s
build (macos-latest, none)	21m 52s
build (macos-latest, rtk)	58m 14s
build (macos-latest, torch)	20m 6s
build (macos-latest, optic)	22m 54s
benchmarks (t1_edep_profiles)	20m 17s
benchmarks (t2_edep_vox)	21m 38s
benchmarks (t3_range_e+)	18m 19s
benchmarks (t4_necr)	12m 11s
benchmarks (t6_dpk)	14m 58s
benchmarks (t7_garf)	22m 28s
benchmarks (t8_LETActor)	17m 47s
benchmarks (t10_SpectroGamma)	49m 17s
benchmarks (t11_EMField)	23m 38s
benchmarks (t12_tessellated_volume)	17m 56s
benchmarks (t13_phsp)	18m 2s
benchmarks (t15_optical)	17m 57s
benchmarks (t16_decay)	17m 5s
benchmarks (t17_extended_source)	19m 37s
benchmarks (t18_movement_benchmark)	18m 0s
benchmarks (t19_acollinearity)	18m 43s
benchmarks (t20_digi_adder)	18m 31s
benchmarks (t22_merged_actor)	18m 39s
benchmarks (t23_digi_readout)	18m 0s
benchmarks (t26_CoinSorter)	18m 9s
benchmarks (t27_Hits_2SD)	18m 29s
benchmarks (t28_Singles_2SD)	18m 7s
benchmarks (t29_optical_digi)	16m 56s
benchmarks (t30_dna)	11m 56s
	10h 47m 15s

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