Change the block font

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/099a7b49-1f14-4056-9223-f3d246babdbb/screencast2020-11-2320-07-02.mp4

We've added functionality that allows you to change the font of blocks. Notes:

1. Selecting the font on the new block doesn't change the fonts of existing blocks
2. New blocks will have the font auto-selected to what was chosen previously
3. You are free to choose different fonts for blocks in the same experience.

You can choose between 2 fonts now:

• Plain
• IBM Plex Sans - Medium

We will add more fonts in future!