What's Changed
* Dark mode theme for documentation by jcapriot in https://github.com/simpeg/discretize/pull/292
* Testing environment updates by jcapriot in https://github.com/simpeg/discretize/pull/294
* Diagonal tree balance by jcapriot in https://github.com/simpeg/discretize/pull/295
* More tree refine functions by jcapriot in https://github.com/simpeg/discretize/pull/296
* Add new refine surface, bounding box, and point refine methods. by jcapriot in https://github.com/simpeg/discretize/pull/297
* Build maintenance by jcapriot in https://github.com/simpeg/discretize/pull/299
* implement zeros outside for interpolation function by jcapriot in https://github.com/simpeg/discretize/pull/298
* Add style testing by jcapriot in https://github.com/simpeg/discretize/pull/300
* Documentation updates by jcapriot in https://github.com/simpeg/discretize/pull/301
* 0.8.3 staging by jcapriot in https://github.com/simpeg/discretize/pull/302
**Full Changelog**: https://github.com/simpeg/discretize/compare/v0.8.2...v0.8.3