Add static examples to a few legacy services [travis david coveralls amo]

[paulmelnikow]

It seems useful to accelerate #1961 even as the badge rewrites are still underway. This introduces a small amount of technical debt by hard-coding the static example, though continuing this work could allow us to eliminate the old ways of specifying examples. It seems like a decent tradeoff.

[shields-ci]

	Warnings
⚠️	This PR modified service code for amo but not its test code. That's okay so long as it's refactoring existing code.
⚠️	This PR modified service code for coveralls but not its test code. That's okay so long as it's refactoring existing code.
⚠️	This PR modified service code for david but not its test code. That's okay so long as it's refactoring existing code.
⚠️	This PR modified service code for travis but not its test code. That's okay so long as it's refactoring existing code.

	Messages
📖	✨ Thanks for your contribution to Shields, @paulmelnikow!

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[PyvesB]

Looks good to me, I'm not too worried about the static example being hardcoded.

[shields-deployment]

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After deployment, changes are copied to gh-pages branch: