Theme Next - Heading typography option Amplitude

[origami-z]

Tasks

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1. Add new foundation typography headings token, default to Open Sans Theme next heading font switch #3396
2. Point h1/2/3/4, display 1/2/3 to new heading token
3. Add new palette layer types (heading / body), point text characteristics to palette instead of foundation #Restructure text tokens in theme #3391
4. Add new amplitude typography foundation variable Theme next heading font switch #3396
5. Add new amplitude font-face declaration file
6. Upload Amplitude font for storybook to use (but not distribute through npm package for licensing issue)
7. Add additional theme-next in palette point heading to amplitude Theme next heading font switch #3396
8. Add additional option to Unstable SaltProvider, to switch between 2 font options Theme next heading font switch #3396
9. Add new toggle to storybook toolbar to demo Theme next heading font switch #3396
10. Font weight remapping
11. Update theme next doc with relevant information