Outline data paper

[dlebauer]

• [x] outline data paper
  • [x] Introduction
  • [x] Methods
  • [x] Data Use
  • [x] Limits of data
  • [x] Future releases
  • [x] define key figures and tables
• [x] use template and / or migrate outline from template to bookdown framework
• [x] delete unused content from repository

[dlebauer]

initial outline is here: https://github.com/terraref/data-paper/blob/develop/outline.md