Add syntax highlighting for TypeScript

[TrevorSayre]

hastebin.com supports TypeScript detection and highlighting, but their service is flakier. Would prefer to use hasteb.in with TypeScript support 👍

[twiclo]

I added typescript support to this fork: https://github.com/zneix/haste-server
With this PR:
zneix#6

See #339 for my reasons behind recommending this fork over the default repo

[github-actions]

This issue is stale because it has been open for 30 days with no activity.