- Update to exhale via `pip`
    - According changes in conf.py
    - Remove _static/collapse (vendored with exhale)
    - custom layout no longer necessary
- Update for Entypo+ docs (new _static files)
- Advanced compilation topics (Eigen, GLFW, custom fonts)
- README.md -> README.rst
    - Shared verbiage in some of index.rst
- A little over half of nanogui/*.h docs reworked
    - Corresponding updates to py_doc.h