Add helper instructions to generate DO token

[facutuesca]

I noticed that the initial config process is a bit painful, since it requires creating a DO token and manually selecting the 23 scopes for it (if one wants to have a minimally scoped token).

I created a bookmarklet that quickly fills the name and the scopes in the DO token creation page, and I put it in an HTML file (along with instructions on how to use it to create the token). The user can choose to see those instructions when running dropkit init. Here's a recording of what it looks like:

Screen.Recording.2026-06-29.at.22.42.26.mov

And once the token is generated, one can go back to the terminal and paste it.

I went with this approach rather than just adding the bookmarklet to the README.md file, because GitHub does not render javascript: links. Hopefully this doesn't add to much friction.

[facutuesca]

closing since asking people to run a bookmarklet on an authenticated page might be fine for an internal tool, but not for a public one.