Skip CI for documentation-only changes

[FaulMit]

What changed

• skip the Windows Build workflow when a push or pull request changes only files under docs/**
• skip the same workflow for Markdown-only changes
• keep CI enabled for application assets, source code, dependencies, installers, tools, and workflow files

Why

The workflow currently runs on every push to main, including screenshot-only commits. GitHub Actions treats every repository commit equally unless path filters are configured.

Validation

• workflow diff contains valid paths-ignore filters for both push and pull_request
• whitespace validation passed
• this PR intentionally changes the workflow itself, so its normal checks still run

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep build-input Markdown files in CI

If a pull request deletes THIRD_PARTY_NOTICES.md or renames it to another Markdown path without updating the project, every changed path matches this ignore rule, so CI is skipped. However, src/Captail/Captail.csproj:38-40 explicitly copies that file to the build output and publish directory; the missing source then breaks subsequent builds and releases, while the push to main is skipped as well. Exempt build-input Markdown files from the blanket ignore or narrow the filter to documentation-only Markdown.

Useful? React with 👍 / 👎.