Remove test snippets

[ethanpalm]

Documentation changes

This PR cleans out test snippets so we stop throwing validation errors. Will require locadex to run after this PR to fully fix the errors.

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Documentation-only deletions; primary risk is unintended removal of files still referenced elsewhere, which would surface as broken links/imports at build time.

Overview
Removes several MDX files used as relative snippet import test fixtures, including folder/relative-snippets-test.mdx, folder/nested/deep-relative-test.mdx, and the associated snippet components/exports (snippets/test-snippet-a.mdx, snippets/test-snippet-b.mdx, folder/local-snippet.mdx, folder/nested/deep-snippet.mdx).

This effectively eliminates the sample relative/absolute snippet import coverage pages from the docs tree to avoid ongoing validation failures (with follow-up tooling/run implied by the PR description).

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