Upload libraries to deno.land/x and upload Ptero.ts once it is refactored

[qrousset]

Adding a module
All modules on deno.land/x need to be hosted as public repositories on GitHub.com.

deno.land/x downloads and stores your repository contents every time you create a git tag. We only do this once for every tag. This ensures that the contents we serve for a specific version can never change.

Our service needs to get informed whenever a new tag is created. For this purpose we use GitHub webhooks.