Add support for json/data imports from node_modules

[equinusocio]

Hello, at Lualtek we’re considering migrating our design system documentation from Nextra to Mintlify. However, after some spike tasks, we discovered it’s not possible to import from node_modules. While we understand this decision, we’d like to know if it’s possible to allow data structure imports like JSON or other static files.

Our design system is built from multiple packages and colour variables and themes are shipped as JSON. Currently, the only solution we’ve found to write documentation is a build script that pulls these data files into local files and imports them as snippets. However, this isn’t particularly elegant.