Next.JS disallows relative imports since 12.0.1 (see
https://nextjs.org/docs/messages/middleware-relative-urls for more
information).  So, we need to sniff out if we are in the NEXTJS
environment and if so, use the fallback URL.

This should resolve:
spacebudz#174

[ Testing: deno task build ]

Merge Latest Conway Changes

Ideally we would want to use the paradigm that the build process set out
to pull from a local lib, but we can't for NextJS.  Since this is a
fork, we don't need to worry about a circular dependency (the fork will
pull from the main).  Without this, NextJS splits the libraries into
chunks and the path resolution fails.

[ Testing: npm i lucid-cardano-nextjs@0.10.10-b4 ]