Remove separate versioned docs dir

This removes around 750MB of docs that were stored under versions. Those
were versioned copies of the entire tree of most mynewt repos. For the
website generatoin, instead of generating docs from versioned tree copies,
just get the information directly from the tagged git releases.
17248 files changed
tree: e7c8cdd34c1b3d1d7e6e9301227ad168b07f8582
  1. docs/
  2. .gitignore
  3. doxygen-mynewt-core.xml
  4. Makefile
  5. README.rst