Add initial yaml dashboard docs

[strawgate]

No description provided.

[github-actions]

Vale Linting Results

Summary: 2 warnings found

⚠️ Warnings (2)

File	Line	Rule	Message
docs/extend/yaml-dashboards.md	42	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.
docs/extend/yaml-dashboards.md	136	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'versus' instead of 'vs'.

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[kpollich]

Do we have any plans to move this to an elastic-owned repo? I'm a little hesitant about linking to build tools in personal repos from our public integration docs.

[github-actions]

The new documentation file docs/extend/yaml-dashboards.md is not included in docs/extend/toc.yml, so it won't appear in the documentation navigation. Consider adding it under the "Build a new integration" section, possibly as a sibling to create-dashboards.md (line 17) or under "Integrations guidelines" alongside dashboard-guidelines.md (line 40).

Example addition to toc.yml:

# Option 1: Under build-new-integration, after create-dashboards.md
      - file: create-dashboards.md
      - file: yaml-dashboards.md  # Add here

# Option 2: Under integrations-guidelines, after dashboard-guidelines.md
      - file: dashboard-guidelines.md
      - file: yaml-dashboards.md  # Add here

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