Remove button class

[wbamberg]

As discussed in #3927, this PR changes all occurrences of class="button" into simple links, except for one where the content was not displayed, so I just removed it.

I've also removed the documentation for .button from the CSS style guide.

[github-actions]

Preview URLs

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• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/Tools_and_testing
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• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/HTML
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/HTML/Introduction_to_HTML
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/HTML/Tables
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/HTML/Multimedia_and_embedding
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/JavaScript
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/JavaScript/Client-side_web_APIs
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/JavaScript/First_steps
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/JavaScript/Building_blocks
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/JavaScript/Objects
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/JavaScript/Asynchronous
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/Forms
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/Accessibility
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/CSS
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/CSS/CSS_layout
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/CSS/First_steps
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/CSS/Styling_text
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Learn/CSS/Building_blocks
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Web/SVG/Applying_SVG_effects_to_HTML_content
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Web/SVG/Namespaces_Crash_Course/Example
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/Web_Audio_API/Using_AudioWorklet
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Web/HTML
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Web/JavaScript
• https://pr4088.content.dev.mdn.mozit.cloud/en-US/docs/Web/CSS

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Title: Applying SVG effects to HTML content
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---

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---

URL: /en-US/docs/Web/API/Web_Audio_API/Using_AudioWorklet
Title: Background audio processing using AudioWorklet
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• macros:
  • /en-US/docs/Web/API/AudioContext/destination redirects to /en-US/docs/Web/API/BaseAudioContext/destination
  • /en-US/docs/Web/API/AudioParamMap/get does not exist

---

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[chrisdavidmills]

LGTM; thanks @wbamberg !