Label positions improve significantly!

### Before

<img width="1003" alt="Screen Shot 2023-03-04 at 11 05 20 AM" src="https://user-images.githubusercontent.com/3120367/222924247-51d0b491-71b5-4d3d-89fd-e22af6e991f4.png">

### After

<img width="1036" alt="Screen Shot 2023-03-04 at 11 05 26 AM" src="https://user-images.githubusercontent.com/3120367/222924254-3b0906e0-360d-44e5-b299-62a8850cab18.png">

#### Improvements 🧹

- Improves edge label positioning
- Improves node label positioning

#### Bugfixes ⛑️

- Fixes a rare bug that could affect edge routes
- Fixes a bug with top and left keywords in nested containers that could cause layout errors