Simplify function templates

[jenae-janzen]

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Simplest update of the function templates, to just include a "hello world" example for the v2 api.

Summary

Fixes #<replace_with_issue_number>

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[github-actions]

📊 Benchmark results

Comparing with 9e5f5c7

• Dependency count: 1,395 (no change)
• Package size: 404 MB (no change)

[minivan]

I think this is an edge function template that we need to keep around