Implement https://status.yorkie.dev

[hackerwins]

Description:

To easily check the operational status of the service, we need to create dedicated status pages for the service.

Before tackling these tasks, @lqez proposed the idea of adding a status page to show the service's current status.

Check out these references for inspiration:

https://status.io/
https://www.githubstatus.com/

This is moved from hackerwins/homepage-old#11

Why:

[krapie]

I'm interested in this issue 😄

For status checking, all we need to do is just health check api.yorkie.dev right?

[hackerwins]

Yes, It would be good to check if Admin API and SDK API are alive for now.