Merge branch 'restructure_detector' into 'master'

bilby/gw/detector/noise_curves/ET_D_psd.txt

bilby/gw/detector/noise_curves/GEO600_S6e_asd.txt

bilby/gw/detector/noise_curves/KAGRA_design_asd.txt

bilby/gw/detector/noise_curves/KAGRA_design_psd.txt

bilby/gw/detector/noise_curves/LIGO_srd_asd.txt

bilby/gw/detector/noise_curves/LIGO_srd_psd.txt

bilby/gw/detector/noise_curves/README.md

bilby/gw/detector/noise_curves/aLIGO_ZERO_DET_high_P_asd.txt

bilby/gw/detector/noise_curves/aLIGO_ZERO_DET_high_P_psd.txt

bilby/gw/detector/noise_curves/aLIGO_early_asd.txt

bilby/gw/detector/noise_curves/aLIGO_early_high_asd.txt

bilby/gw/detector/noise_curves/aLIGO_early_high_psd.txt

bilby/gw/detector/noise_curves/aLIGO_early_psd.txt

bilby/gw/detector/noise_curves/aLIGO_late_asd.txt

bilby/gw/detector/noise_curves/aLIGO_late_psd.txt

bilby/gw/detector/noise_curves/aLIGO_mid_asd.txt

bilby/gw/detector/noise_curves/aLIGO_mid_psd.txt

bilby/gw/detector/noise_curves/aplus.txt

bilby/gw/detector/noise_curves/highf_psd.txt

bilby/gw/detector/noise_curves/lisa_asd.txt