Fix docs URL basepath

[jxnblk]

Fixes #363

• Uses the link component from mdx-docs in markdown to correctly handle base path since Next.js does not current support (see Feature request: Basepath support vercel/next.js#4998)
• Updates dependencies for docs site

[codecov-io]

Codecov Report

Merging #395 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #395   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          42     42           
  Lines         481    481           
=====================================
  Hits          481    481

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