fix(theme): for feeds, don’t include code block buttons outside of br…

[kennethormandy]

Right now, code block “wrap” and “copy” buttons will show up in RSS feeds, and (as far as I’m aware) can’t be omitted using any feed config or existing settings.

Depending on the feed reader or the service consuming the feed, these empty <button> elements will still be treated as part of the content, alongside the code blocks.

Since these buttons don’t have any purpose outside of a browser-based context anyway, this PR removes those buttons unless they are being displayed in the browser.

Thanks!

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

I’m sending my RSS feed to an email newsletter service, which imports the content.

Since the buttons are currently part of the feed content, it is trying to import that too.

Test Plan

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

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