feat: remove pricing tables and provide links to pricing landing page

[dasanra]

What it solves

Removes direct references to API plans prices and specs and links to an unified source of truth, the landing page.
Remove duplicated information and condense it to be easier to follow

Changelog

• feat: remove pricing tables and provide links to pricing landing page
• feat: remove duplicated information and organize it to be easier to follow

Checklist

• I've followed all safe-docs pull request rules

[github-actions]

Branch preview

✅ Deployed successfully in branch deployment:

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

[github-actions]

Overall readability score: 37.02 (🟢 +0.08)

File	Readability
webhooks-setup.mdx	55.91 (🟢 +0.95)
webhooks-overview.mdx	58.49 (🔴 -0.79)
how-to-use-api-keys.mdx	56.61 (🟢 +11.04)
api-overview.mdx	28.57 (🔴 -1.58)
api-authentication.mdx	54.57 (🔴 -0.01)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
webhooks-setup.mdx	55.91	45.22	8.75	10.9	13.77	8.71
	🟢 +0.95	🟢 +0.1	🔴 -0.01	🟢 +0.3	🟢 +0.23	🟢 +0.06
webhooks-overview.mdx	58.49	44.71	8.51	10.3	13.02	8.61
	🔴 -0.79	🟢 +0	🔴 -0.01	🔴 -0.2	🔴 -0.23	🔴 -0.05
how-to-use-api-keys.mdx	56.61	43.8	9.29	11.4	13.03	8.23
	🟢 +11.04	🟢 +10.7	🟢 +1.95	🟢 +1.7	🟢 +0.7	🟢 +0.77
api-overview.mdx	28.57	23.77	13.77	18.5	16.53	8.79
	🔴 -1.58	🔴 -0.1	🔴 -0.27	🔴 -0.3	🔴 -0.29	🔴 -0.08
api-authentication.mdx	54.57	43.9	9.18	11.2	13.6	8.77
	🔴 -0.01	🟢 +7.24	🟢 +0.01	🔴 -0.3	🔴 -0.06	🔴 -0.22

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	37.02	31.68	13.11	16.29	14.73	8.7
	🟢 +0.08	🟢 +0.1	🟢 +0.01	🟢 +0.01	🟢 +0.01	🟢 +0.01

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