The handbook has moved into a new repo

[Mabsten]

From the readme of the old repository:

The handbook has moved into the new TypeScript website repo, you can find the revised and updated handbook pages in /packages/documentation in that repo.

The handbook in the new repo covers Typescript 4.0 (for example, in the release notes), absents in the old repo (that contains the release notes for Typescript 3.9, not the newers).

Anyway, thank you very much for your tool.