chore(deps): bump markdown-it and markdownlint

[dependabot]

Removes markdown-it. It's no longer used after updating ancestor dependency markdownlint. These dependencies need to be updated together.

Removes markdown-it

Updates markdownlint from 0.26.2 to 0.40.0

Changelog

Sourced from markdownlint's changelog.

0.40.0

• Improve MD011/MD013/MD051/MD060
• Update dependencies

0.39.0

• Add MD060/table-column-style
• Improve MD001/MD007/MD009/MD010/MD029/MD033/MD037/MD059
• Add support for reporting violations as severity warning
• Deprecate resultVersion and toString (breaking change)
• Improve type definitions
• Improve demo web page
• Update dependencies

0.38.0

• Add MD059/descriptive-link-text
• Improve MD025/MD027/MD036/MD038/MD041/MD043/MD045/MD051/MD052
• markdown-it parser no longer a production dependency (breaking change)
  • Add markdownItFactory option, remove markdownItPlugins option
• Remove support for end-of-life Node version 18
• Improve performance
• Update dependencies

0.37.4

• Stop using module.createRequire, export resolveModule

0.37.3

• Tweak package.json dependencies to work with pnpm

0.37.2

• Add subpath imports for overriding default bundler behavior
• Improve MD032

0.37.1

• Add support for "browser" condition (as used by webpack)

0.37.0

• Convert module to ECMAScript (breaking change)
  • https://nodejs.org/docs/latest/api/esm.html
  • https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
• Convert module to named exports (breaking change)

0.36.1

... (truncated)

Commits

• 63fefcb Update to version 0.40.0.
• dc97978 Add scenarios for aligned tables with irregular trailing pipes.
• e645385 Update test repository snapshots.
• 240e27b Update test repository snapshots.
• b3a49a7 Update MD060/table-column-style to rename "heading" to "header" for consisten...
• f6c5369 Update MD060/table-column-style to add aligned_delimiter parameter (fixes #18...
• 8e974f9 Update MD013/line-length default mode to prevent trailing non-whitespace text...
• 6019101 Remove outdated table-column-style suppression from dotnet/docs test repo.
• 9ad696e Add more tests for MD013/line-length edge case behavior.
• d8bf33d Refactor MD013/line-length to simplify length check.
• Additional commits viewable in compare view

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[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.