docs: Add reference for relay-kit

[dasanra]

Context

This PR:

• TBD

[github-actions]

Overall readability score: 70.16 (🔴 -0.36)

File	Readability
gelato.md	75.59 (🟢 +0.53)
GelatoRelayPack.md	69.88 (-)
README.md	80.06 (🔴 -19.94)
RelayKitBasePack.md	70.74 (-)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
gelato.md	75.59	64	8.53	8.9	9.45	6.47
	🟢 +0.53	🟢 +0	🟢 +0.1	🟢 +0.1	🟢 +0.06	🟢 +0.04
GelatoRelayPack.md	69.88	50.02	8.39	8.9	10.48	7.15
	-	-	-	-	-	-
README.md	80.06	74.19	8.2	7.5	8.11	7
	🔴 -19.94	🔴 -25.81	🔴 -2.2	🔴 -1.5	🔴 -2.11	🔴 -2.1
RelayKitBasePack.md	70.74	59.4	8.32	8.5	10.6	7.53
	-	-	-	-	-	-

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	70.16	61.08	9.15	9.48	10.32	7.03
	🔴 -0.36	🔴 -0.73	🔴 -0.01	🟢 +0	🔴 -0.05	🔴 -0.05

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[germartinez]

Closed as the Gelato Relay Reference (not working with the ERC-4337 in the way it is integrated in the SDK) is not a priority.
Gelato Relay Reference will be rechecked once/if the SDK integrates the ERC-4337 Gelato implementation.