Move to monorepo

[eaton]

Long term, the structure of the project will be a bear; it's a toolbox that keeps growing and not everyone needs the same stuff. One possible structure:

• Core: Project, Graph data model, and Spider.
• CLI: Probably based on oclif, simple commands for kicking off a crawl, testing URLs in batches, etc
• Reports: Bundle our wrappers for D3, SheetsJS, various canned AQL queries, and any other standard tools for presenting final output
• Integration: Wrappers and helpers for pulling data from other APIs, particularly Google Analytics and Pagespeed/Lighthouse scores
• Analysis: Analyzers and any additional graph entities that go along with them: htmlToText integration, readability scoring, language/tag extraction, URL-based hierarchy building, graph-based algorithms for pathfinding and fundability ranking, etc would go here.