Draft changelog: Free plan redesign and domain migration - #413

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

- changelog/september-2026.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/changelog/september-2026.mdx:
	- 3:28      Did you really mean 'urBackend'?
	- 29:37     Did you really mean 'urBackend'?
	- 29:162    Did you really mean 'urBackend'?
	- 30:150    Did you really mean 'urBackend'?
	- 36:202    Did you really mean 'urBackend'?
	- 37:15     Did you really mean 'navbar'?
	- 43:5      Did you really mean 'urBackend'?
	- 43:106    Did you really mean 'urBackend'?
	- 43:144    Did you really mean 'Astro'?


Found 9 suggested changes across 1 files in 451.81ms