Add copy button to hard-coded API docs

[jhgilbert]

What does this PR do? What is the motivation?

Merge readiness

Adds a button to the hard-coded (non-generated) API docs. There are only four pages like this, all in the Overview section (example).

Note that CORS errors are expected in staging, since there is no staging plaintext build, so the Copy button fails over to the HTML scrape. But you can see that the URL of the failed request does exist (for example, https://docs.datadoghq.com/api/latest.md), so it would work fine in prod, where the request would be coming from the same origin (docs.datadoghq.com).

Also removes an unwanted underline on hover, the CSS just wasn't fleshed out enough on the original button.

If you're the docs reviewer, not much for you to do here, feel free to stamp it. I can seek CorpWeb approval myself, don't worry about escalating it for me.

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/jen.gilbert/hardcoded-api-docs-copy/api/latest/
• https://docs-staging.datadoghq.com/jen.gilbert/hardcoded-api-docs-copy/api/latest/rate-limits/
• https://docs-staging.datadoghq.com/jen.gilbert/hardcoded-api-docs-copy/api/latest/scopes/
• https://docs-staging.datadoghq.com/jen.gilbert/hardcoded-api-docs-copy/api/latest/using-the-api/

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