Create tric-dt book

[chrisdburr]

Summary Sentence

Create a barebones book, using Jupyter Book, for this repository.

What needs to be done?

• [x] Setup branch
• [x] Setup jupyter-book directory
• [x] Add placeholder files
• [x] Configure toc.yml and config_yml files
• [x] Setup GH action
• [x] Notify team

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Update after the issue was opened

[Add details]

[chrisdburr]

Task completed (https://github.com/alan-turing-institute/tric-dt/commit/2dfc724549f587e43ca9c404260185859c7b59c1).

Need to create plan and respective issues for drafting and adding content.