Add documentation page on typescript configuration

[roshan-sama]

The docs mention the usage of typescript in different locations such as in css modules, but we dont have an explicit page describing how typescript is configured and how to modify that configuration.

• [ ] Add link under configuration, below the blitz.config.js link
• [ ] Describe what typescript is
• [ ] Describe how Blitz configures typescript by default, explaining how this configuration can be modified.

[Croftyland]

Could I pick this one up?

[roshan-sama]

Yep! Go ahead