Add Mobile Support

[jwr1]

The website looks great so far, but on mobile devices, people might find it challenging to navigate around, especially on smaller devices.

• We need to make the navbar(font list) retract into the side on smaller devices and add a button to open it.
• We also need to make the font a little smaller.

[jwr1]

Fixed issue in https://github.com/fontsource/search-directory/commit/9b89c0a219714035b26875d31193949b4b2e8906 commit.