move to local fonts b/c the alternative is dumb

[aslink87]

fixes #61

We were using next/fonts and users were sometimes unable to download the fonts causing fallbacks to render.
Here I've moved to only local fonts for the project.

This involved:

• refactoring route headings to use a custom <PageHeading> component that applies a local heading font
• defaulted the entire app to a local body font
• had to update the side nav drawer a bit to allow for the component
• Chakra is failing to apply custom fonts in its extendTheme function. If that wasn't the case we could have defined the heading and body fonts there instead of injecting them in a custom <PageHeader> component, or importing them within the app.