Fix markdownlint errors

[glen-84]

Summary of the changes (Less than 80 chars)

• Fixes MD001, MD026, MD037, MD040, MD041, MD045, and MD053
• Adds rationale for disabling MD013, MD025, MD028, MD029, and MD036
• Sets parameters for MD024 and MD033
• Fixes errors in root-level Markdown files
• Moves markdownlint configuration file to root of repository
• Cleans up .markdownlint.yml file
• Deletes unused .markdownlintrc file
• Removes markdownlint configuration from VS Code settings.json
• Adds markdownlint extension to .vscode/extensions.json

Closes #5460

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.52%. Comparing base (f7dfae1) to head (692b99d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7100      +/-   ##
==========================================
- Coverage   79.68%   79.52%   -0.17%     
==========================================
  Files        2632     2649      +17     
  Lines      131383   131946     +563     
==========================================
+ Hits       104692   104924     +232     
- Misses      26691    27022     +331     

Flag	Coverage Δ
unittests	79.52% <ø> (-0.17%)	⬇️

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[github-actions]

Qodana for .NET

It seems all right 👌

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