Refresh and solicit feedback on vignettes

[jimjam-slam]

As well as scanning the docs to ensure they're still current for 0.5.1, I need to rewrite the vignettes and see how readable they are. The current one could use some work, and I'd like to split up vignette topics (or sections) around these ideas:

• Intro to list columns and associated workflows
• Collateral basics:
  • What am I looking at?
  • Extracting side effects
• More advanced workflows
  • Filtering on and summarising side effects
  • Successive operations with collateral

I'd really like to work out coloured output first, but I probably shouldn't make it a must.

Of course, if someone wants to take a swing at this, I'd be happy to accept a PR!