Docs: Add Authdog to Turbo Showcase page (#2921)
[Authdog](https://www.authdog.com/) is an Identity and Access Management as a Service platform, built upon Serverless technologies (AWS Lambda, Vercel, Fastly and Cloudflare Workers). I started looking for alternatives to Nx, some times ago and experimented with Turbo, decided to migrate some projects to this tool, awesome stuff!
