## What kind of change does this PR introduce?
Content: slug update for an already-live customer story.
## What is the current behavior?
The Lingo.dev customer story (originally added in #49595) lives at
`/customers/lingo-dev`.
## What is the new behavior?
- Renames `apps/www/_customers/lingo-dev.mdx` to
`apps/www/_customers/lingodotdev.mdx`.
- Updates the `url` in `apps/www/data/CustomerStories.ts` to
`/customers/lingodotdev`.
- Adds a permanent redirect from `/customers/lingo-dev` to
`/customers/lingodotdev` in `apps/www/lib/redirects.js`.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added a customer story highlighting Lingo.dev’s localization workflow,
platform usage, security practices, results, and future plans.
* **Bug Fixes**
* Updated the customer story link to its new URL.
* Added a permanent redirect so existing links to the previous URL
continue to work.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: Wendie Cheung <wendie.cheung@supabase.io>