improve docs examples in hyperdrive gitbook

[dpaiton]

We need to update these to reflect the refactors after #1452 . At that time we should port over the tutorials so the same ideas are conveyed in docs format. In addition to tutorials we should include a section for smaller examples of prototypical actions like "auto-withdraw matured positions".

[dpaiton]

We should just remove any examples from gitbook and point people to the agent0 docs page as quickly as possible.

While we're at it lets make an Examples heading in the README and link to the examples folder.