docs: add swizzle delete tip

[effozen]

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

While customizing the theme, I noticed there is very limited guidance on how to remove swizzled components. The only mention I found was in the "Which component should I swizzle?" section, which states: "Don't forget to unswizzle the rest by deleting the files after you've found the correct one, so you don't maintain too many components."

As a junior developer, I found this explanation insufficient for understanding the exact steps needed to properly remove swizzled elements. Therefore, I decided to add a more explicit tip. I hope this addition will help other developers—especially those who are new to Docusaurus or not yet confident in their development skills—use the tool more effectively.

Changes

:::tip Removing Unneeded Swizzled Components

If you decide that a previously swizzled component is no longer necessary, you can simply remove its file(s) from the `src/theme` directory. After removing the component, make sure to restart your development server to ensure the changes are properly reflected.

:::

Add this tip on Overview section.

Below is tip image.

Test Plan

Test links

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

Related issues/PRs

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[slorber]

thanks 👍