Todo list: Docs

[prrao87]

Recording some todo items based on the discussion with @krypticmouse:

• Update quickstart docs @krypticmouse
• Write docs for Predictor and explain how it's different from Modules in DSRs @krypticmouse
• Rewrite LM documentation @prrao87
  • Describe how to visualize prompts via inspect_history()
• Rewrite example code for README and the various section of the docs @prrao87