Create hyperbook from VS Code extension

[mikebarkmin]

We should add a new command hyperbook.new for creating a new hyperbook. It should work the same as the cli application. Therefore, we need to implement something similiar to this: https://github.com/microsoft/vscode-extension-samples/tree/main/quickinput-sample

We should also add a step for asking a platform for publishing: (GitHub, GitLab, EduGit, Vercel or custom).

Maybe we can extract the functionality of creating a new hyperbook of the hyperbook package into a new package to keep the cli and the vs code extension in sync.