CE3 Documentation Mega-TODO List

It's a little easier to consolidate these things into one place. Structuring things based on the sidebar:

• Overview
  • Need a beginner-friendly explainer of what IO is
  • Performance page touching on some top-line general numbers and concepts
  • Tracing documentation
• Getting Started (this whole section should probably just be ported from CE2's microsite, because the walkthrough and topic is good)
• Best Practices (this should be a section covering best practices on how to structure your applications, ways to solve certain problems like dependency injection, etc; general "leveling up" stuff)
• Standard Library
  • Console
  • Random
  • Some of the articles in this section also need a bit of cleanup for consistency
• Ecosystem (I'm envisioning this as a use-case focused section with entries for "Http" (subsections "Client" and "Server"), "Kafka", etc; mostly just linking to external libraries and maybe giving a quickly copy/pasteable snippet for sbt and call-site)
• Scaling and Tuning (advice for how you run Cats Effect-powered services at scale and what it means to tune them for high load)

The issue is a broad documentation backlog organized by the sidebar, covering Overview, Best Practices, Standard Library, Ecosystem, and Scaling and Tuning; Getting Started is marked complete and should be ported from CE2's microsite. Begin by selecting and separately scoping one unchecked section or article. Done is not defined for the mega-list as written, so a contributor needs a concrete subsection and acceptance criteria first.