text: Title: Docs upgrade
  Body: Leaving this from #653, which is a pretty good thing!
  
  If you're thinking about potential changes to the docs, one thing I've been thinking about is providing an alternate/additional view for users to discover functions. I think a user looking at our API pages can see all the functions `janitor` has, and what they do, but we could also have a version where someone is browsing the page, or coming from a search engine with the question, 
  
  *"How do I remove duplicate columns in pandas?"*
  
  and can then find the function they want, potentially see what it would take in pure `pandas`, and how we do it in `pyjanitor`.
  
  _Originally posted by @hectormz in https://github.com/ericmjl/pyjanitor/pull/653#issuecomment-628960074_