Feature ETP-2107: Rewrite Accounting Templates page

[mapenglishservices]

Summary

• Rewrites the Accounting Templates page as a user guide with improved field descriptions and cross-links
• Adds new sections: Dataset Definition, Dataset Testing, and How Accounting Templates Work
• Adds alt text to images and links to related pages (Document Type, General Ledger Configuration, Account Tree, Initial Organization Setup)

Test plan

• Verify mkdocs build --strict passes
• Review rendered page on preview for formatting and link correctness
• Confirm all cross-links resolve to valid pages

🤖 Generated with Claude Code

[etendobot]

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