Add top-level rcs page #3386

Job	Run time
Initial setup	2s
devmirror lint	2m 10s
devmirror abvar/fq bianchi_modular_forms number_fields	3m 46s
devmirror galois_groups siegel_modular_forms	4m 33s
devmirror elliptic_curves hecke_algebras tests	2m 19s
devmirror hilbert_modular_forms sato_tate_groups tests	2m 8s
devmirror api characters cluster_pictures ecnf local_fields	5m 33s
devmirror belyi higher_genus_w_automorphisms hypergm lattice maass_forms tests users	1m 51s
devmirror artin_representations genus2_curves	2m 46s
devmirror classical_modular_forms	11m 27s
devmirror lfunctions	5m 47s
devmirror groups/abstract	3m 20s
devmirror modular_curves	3m 1s
	48m 43s

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