Peekingduck

**Improved Documentation**

- Update Read the Docs page with new colour scheme and layout
- Update benchmarks with model accuracies
- Replace PoseNet 101 with PoseNet 100 in model types due to higher accuracy
- Update CONTRIBUTING.md
- Update CODE_OF_CONDUCT.md
- Streamline README.md by adding section that directs users to Read the Docs page

**Bug Fixes**

- Fix error in Linux when `input.live` and `output.screen` are used and `q` is pressed to terminate process
- Fix zone counting use case failing due to incorrect dependencies
- Fix average FPS calculation of `dabble.fps` by ignoring fast final frame which skews the results

**Improved Documentation**

- Add FPS benchmark results
- Update instructions for configuring nodes via CLI
- Update instructions for building custom nodes
- Update instructions for using Python API

**Dependencies**

- Update shapely to 1.7.1 to resolve zone counting use case issue