Merge dense MLEs & update documentation (#763) #2900

Job	Run time
Check Style	6s
Check (stable)	8s
Test (stable)	9m 18s
Check (nightly)	1m 11s
Test (nightly)	17m 56s
Check no_std	1s
List directories for parallelizing tests	4s
Check Documentation	1m 1s
Test assembly	8m 35s
Test (cp6_782/)	5s
Test (mnt4_753/)	18s
Test (mnt6_753/)	10s
Test (./ed25519)	58s
Test (./mnt6_298)	5m 35s
Test (./grumpkin)	1m 7s
Test (./ed_on_cp6_782)	2m 0s
Test (./ed_on_mnt4_753)	4m 2s
Test (./ed_on_bw6_761)	44s
Test (./bls12_381)	3m 22s
Test (./ed_on_bls12_381_bandersnatch)	1m 16s
Test (./ed_on_mnt4_298)	1m 19s
Test (./secq256k1)	56s
Test (./bn254)	2m 26s
Test (./mnt4_298)	3m 56s
Test (./secp256r1)	55s
Test (./vesta)	1m 17s
Test (./ed_on_bn254)	1m 0s
Test (./bw6_761)	3m 59s
Test (./curve25519)	1m 13s
Test (./pallas)	1m 20s
Test (./ed_on_bls12_377)	1m 18s
Test (./secp384r1)	1m 57s
Test (./secp256k1)	1m 4s
Test (./ed_on_bls12_381)	1m 27s
Test (./bls12_377)	4m 14s
Test (./bw6_767)	4m 13s
	1h 30m 31s

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