Mc/sandbox docs skeleton

[iAmMichaelConnor]

Description

• Introduce a suggestion for the docs directory structure.
• Introduce a 'preprocessor' macro which enables code from the codebase to be injected as a code snippet into the docs, before docusaurus builds the docs.
• Wrote some actual docs.

Checklist:

• I have reviewed my diff in github, line by line.
• Every change is related to the PR description.
• I have linked this pull request to the issue(s) that it resolves.
• There are no unexpected formatting changes, superfluous debug logs, or commented-out code.
• The branch has been merged or rebased against the head of its merge target.
• I'm happy for the PR to be merged at the reviewer's next convenience.

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[iAmMichaelConnor]

^^^ I have no idea how Netlify was able to deploy anything, because I rugged the /docs/docs/ file... There is no /docs/docs/ file from which it can build? Is it clever enough to know to use /docs/draft-docs/? Surely not?

[critesjosh]

Netlify runs yarn build then serves whatever is in docs/build. It looks like yarn build runs your preprocessor which, from what I understand, populates the docs/docs dir--and then builds from docs/docs.

aztec-packages/docs/package.json

Line 10 in 064c8af

"build": "yarn preprocess && docusaurus build",