Add persistAssets and persistTags options to the head plugin

[ethrx]

Description

The Head Plugin is very useful for Astro applications that have a mix of react providers or components that, for example, will only update the head once.

Adding persistAssets and persistTags provides the intended usage of the Head plugin, allowing us to keep certain tags from the previous page state.

Checks

• The PR is submitted to the main branch
• The documentation was updated as required

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[daun]

@ethrx Thanks! Good idea to make those available.

I'd prefer to nest those new keys under the existing updateHead key. Similar to the existing preload which is either a boolean or an object with nested options: preload: boolean | { hover: boolean; visible: boolean }. Could you change it to work like that, please?

[ethrx]

@daun thanks! I think the latest change resolves your comment, and I've updated the README.md to closely match how preload is structured and https://swup.js.org/plugins/head-plugin/

Let me know if this wasn't the change you had in mind :)