Clean up DOSDP repo

[dosumis]

• [x] Move old code (Jython) to attic folder
• src
  • [x] limit to simple python checker (?) & runner scripts
  • [x] Update README.md
• [x] formal spec: remove defunct spec files.
• [x] Write up more complete doc using 'read the docs' (& push to github.io)
• [x] Recommend DOSDP scala for implementation
• [x] Add link to paper

[hkir-dev]

Mkdocs documentation publishing completed: https://incatools.github.io/dead_simple_owl_design_patterns/

Github action is triggered when; new release, updating README.md or files under docs/ (in the master branch only)