Sync (#19)

* Basic File Texture Support (#2)

* - Add basic texture / image append if a file reference is found.
- Add simple file example.

* - Cleanup constant strings.
- Extract out fallback texture logic to addFallbackTexture() method.
- Normalize variable naming.

* More cleanup. Remove python build scripts as using shell scripts.

* Docs cleanup / CI cleanup (#4)

* Ad notebook. Fix up docs formatting.

* Update CI for github pages.

* Fix CI

* Check if replace string is being set.

* Try fixing up doxygen version.

* Revert doxygen change. Don't build docs in CI.

* Sync

* Fix html.