Add new skill for custom markdown to html covnersion

[jhauga]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, or skill file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, or skill with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

Testing

Did a control branch, and a test branch; which used the skill.

Disclaimer

The test branch produced near production ready tool, but to be honest - I wasn't sure about making
this PR, as the control test did better on initial prompt, but since there are several contexts
for which the skill can be used, I thought I would make the PR anyway as I'm still going to use the skill
locally for some tools, and would like to be able to download to different projects via
vscode-awesome-copilot.

Control Branch

Only using the reference files with the prompt file markdown-to-html.prompt.md.

Test Branch

I prompted a bit more in favor of the test using the skill, polishing the results with over 10
prompts total. But the results speak for themselves. The branch that used the skill is debatable
a ready to publish tool for converting markdown to html with an additional feature of easily
applying html attributes to the parsed html data.

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New collection file.
• New skill file.
• Update to existing instruction, prompt, agent, collection or skill.
• Other (please specify):

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

This pull request adds a new skill called "markdown-to-html" for converting Markdown files to HTML using various tools and libraries like marked.js, pandoc, gomarkdown/markdown, Jekyll, and Hugo. The skill provides comprehensive reference documentation for markdown-to-html conversions across multiple tools and frameworks.

Changes:

• Added a new skill in the skills/markdown-to-html/ directory with SKILL.md and 14 reference files
• Updated docs/README.skills.md to include the new skill entry in the skills table
• Provided extensive reference documentation covering basic markdown syntax, code blocks, tables, mathematical expressions, collapsed sections, and conversion tools

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 16 comments.

File	Description
skills/markdown-to-html/SKILL.md	Main skill definition with front matter and comprehensive conversion examples for multiple tools
skills/markdown-to-html/references/*.md	14 reference files covering markdown syntax, conversion examples, and tool-specific documentation
docs/README.skills.md	Added skill entry to the skills documentation table