Update swizzleAllowedComponents

[Josh-Cena]

🐛 Bug Report

The template doesn't really apply, but this issue is just a quick notice that the swizzleAllowedComponents in theme-classic hasn't been updated for long. A lot of small components should be swizzlable without the --danger flag.

Some components that almost certainly should be added:

• BackToTopButton;
• Details;
• EditThisPage;
• IconExternalLink;
• IconLanguage;
• ...

[slorber]

Yes, agree.

I'll update this list once I add the "slots/placeholders component" that I mentioned in another issue.

If you want to update it, feel free to submit a PR. As a general rule I'd say we should mark swizzle as not dangerous as long as the comp is purely UI-related, with a small and clean API (props/context usage) and does not contain complicated complex Docusaurus login. (DocSidebar should rather be moved to --danger for example)