Release 2.0.0

📦 Now notebooks and Settings UI are consistent with the rest of the theme b3c640

✨ Ensure the UX palette is scalable and consistent ab85fe
✨ Improve highlight colours for better visibility e717e8
✨ Rearrange the themes to have groups of tokens 3fb5c0f
✨ Fix merge colours - now AAA compliance 3e9716
✨ Reduce number of highlight colours cf12b0