docs: remove old docs storage

[janniks]

This PR was published to npm with the version 6.14.0
e.g. npm install @stacks/[email protected] --save-exact

remove outdated docs .md storage

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
stacksjs-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 13, 2024 11:27am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.44%. Comparing base (f39637c) to head (f066584).
Report is 7 commits behind head on main.

❗ Current head f066584 differs from pull request most recent head ea462b1. Consider uploading reports for the commit ea462b1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1687      +/-   ##
==========================================
+ Coverage   66.38%   66.44%   +0.05%     
==========================================
  Files         119      119              
  Lines        8823     8832       +9     
  Branches     1970     1971       +1     
==========================================
+ Hits         5857     5868      +11     
+ Misses       2721     2719       -2     
  Partials      245      245              

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