feat: add basic book CI

Signed-off-by: Brandon H. Gomes bhgomes@pm.me

Migrates book from old docs repo and adds basic deployment CI.

Before we can merge this PR, please make sure that all the following items have been checked off:

[x] Linked to an issue with discussion and accepted design OR have an explanation in the PR that describes this work.
[x] Added one line describing your change in CHANGELOG.md and added the appropriate L- label to the PR.
[x] Re-reviewed Files changed in the GitHub PR explorer.
[x] Checked that changes and commits conform to the standards outlined in CONTRIBUTING.md.

openzklib / openzl