feature: personal templates

[triptych]

Is your feature request related to a problem? Please describe. The global Observable Templates are very handy, and have a lot of great features. I would like to be able to flag one or more of my own notebooks as 'personal templates' - so that when I hit the "new" button, they show up as an option on the left:

Use cases: blog post template - with my own style, images, links app templates - I want to use my own Three.js template perhaps classroom templates -- a teacher want our assignments done with a certain template.

Extra credit: flag "any" template as a personal template --> say some user foo has a really cool D3 template that I want to use over and over, I add it to my "personal" templates. (A workaround of course is to fork their notebook and now it's "mine" to use )

Describe the solution you'd like Step 1 : flag a notebook as a personal template Step 2: see that notebook show up on the list when I press "new notebook" - in it's own group. (Above the generic templates)

Describe alternatives you've considered I've thought about making a Templates collection but it's pretty cumbersome.

Additional context Yes, all notebooks are clonable, but would like to have a collection of notebooks I could create for myself to make writing notebbooks easier.

[tophtucker]

Teams can now do this, as of February https://observablehq.com/@observablehq/team-templates; I wonder if it could be extended to Pro users…

[CobusT]

This is now available to all Pro users and Pro teams.