update: add new guide from Dynamic

[tanay1337]

Context (internal link from Slack): https://5afe.slack.com/archives/C07LWM33E2C/p1730100306774659

• Adds a link to the Further Reading section of the Dynamic Signer doc.
• Adds the link to the Resource Hub.

[github-actions]

Branch preview

✅ Deployed successfully in branch deployment:

https://dynamic_updates--docs.review.5afe.dev

[github-actions]

Overall readability score: 32.4 (🟢 +0.01)

File	Readability
dynamic.mdx	54.22 (🟢 +2.86)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
dynamic.mdx	54.22	55.17	12.6	15.3	10.22	7.26
	🟢 +2.86	🟢 +1.42	🟢 +0.6	🟢 +0.8	🟢 +0.06	🟢 +0.11

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	32.4	27.92	13.41	17.63	15.64	8.78
	🟢 +0.01	🟢 +0.01	🟢 +0	🟢 +0	🟢 +0	🟢 +0

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