Update from code changes: sync Free-tier plan limits and gating - #412

Running Vale across on the following files affected by this PR:

- cli/overview.mdx
- guides/mail-platform.mdx
- guides/webhooks.mdx
- limits-and-quotas.mdx

Attempting to initialize Vale linter...
No customer vale configuration detected. Using Mintlify's default configuration.
Attempting to run Vale spellcheck...
Vale spellcheck completed successfully.

mintlify/docs/cli/overview.mdx:
	- 3:19      Did you really mean 'urBackend'?
	- 24:135    Did you really mean 'urBackend'?
	- 51:74     Did you really mean 'urBackend'?
	- 54:21     Did you really mean 'urBackend'?
	- 63:45     Did you really mean 'urBackend'?
	- 64:98     Did you really mean 'urBackend'?
	- 73:307    Did you really mean 'optionals'?
	- 84:12     Did you really mean 'urBackend'?
	- 88:15     Did you really mean 'urBackend'?
	- 148:74    Did you really mean 'urBackend'?

mintlify/docs/guides/mail-platform.mdx:
	- 3:49       Did you really mean 'urBackend'?
	- 8:1        Did you really mean 'urBackend'?
	- 16:38      Did you really mean 'Svix'?
	- 23:28      Did you really mean 'urBackend'?
	- 65:3       Did you really mean 'urBackend'?
	- 72:10      Did you really mean 'urBackend'?
	- 80:58      Did you really mean 'Svix'?
	- 200:36     Did you really mean 'Zod'?
	- 446:184    Did you really mean 'urBackend'?
	- 510:1      Did you really mean 'Svix'?
	- 587:35     Did you really mean 'walkthrough'?
	- 595:68     Did you really mean 'lookups'?
	- 596:40     Did you really mean 'Svix'?
	- 608:52     Did you really mean 'resendId'?
	- 613:42     Did you really mean 'audienceId'?
	- 616:32     Did you really mean 'passthrough'?
	- 618:23     Did you really mean 'urBackend'?

mintlify/docs/guides/webhooks.mdx:
	- 6:14     Did you really mean 'urBackend'?
	- 6:212    Did you really mean 'Zapier'?
	- 12:43    Did you really mean 'urBackend'?
	- 15:22    Did you really mean 'urBackend'?

mintlify/docs/limits-and-quotas.mdx:
	- 3:90       Did you really mean 'urBackend'?
	- 8:1        Did you really mean 'urBackend'?
	- 66:22      Did you really mean 'urBackend's'?
	- 66:43      Did you really mean 'Groq'?
	- 86:88      Did you really mean 'Groq'?
	- 103:84     Did you really mean 'urBackend'?
	- 103:137    Did you really mean 'backoff'?


Found 38 suggested changes across 4 files in 538.31ms