feat: markdown rendering with ansi-escapes (fixes #328)

[BitForge95]

Summary

This PR re-implements the Markdown rendering feature using standard libraries as requested.
It replaces the previous PR #332.

Changes:

• Uses npm:supports-hyperlinks (via deno.json import map) for robust terminal detection.
• Uses npm:ansi-escapes (via deno.json import map) for generating link sequences.
• Removed manual terminal detection logic.

Closes #328

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.00%. Comparing base (05282f9) to head (a76a6d3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #347   +/-   ##
=======================================
  Coverage   87.00%   87.00%           
=======================================
  Files          51       51           
  Lines        3887     3887           
  Branches      624      624           
=======================================
  Hits         3382     3382           
  Misses        495      495           
  Partials       10       10           

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[effigies]

This was already merged. We had to pull it out while we dealt with some bugs, but it's in the latest release.