feat: The timing of the doneEach hook call for the cover

[YiiGuxing]

Summary

The doneEach hook function for the cover should be called after the cover page HTML has been appended to the DOM.

Related issue, if any:

What kind of change does this PR introduce?

Feature

For any code change,

• Related documentation has been updated, if needed
• Related tests have been added or updated, if needed

Does this PR introduce a breaking change?

No

Tested in the following browsers:

• Chrome
• Firefox
• Safari
• Edge

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Name	Status	Preview	Comments	Updated (UTC)
docsify-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2024 2:17pm

[jhildenbiddle]

Thanks of this, @YiiGuxing. Can you add some tests to test/e2e/plugins.test.js to verify the new behavior? Thx!

[YiiGuxing]

@jhildenbiddle. Completed. Please review.

[YiiGuxing]

@jhildenbiddle, I found that this PR does not work in the asynchronous mode of marked.js. I am fixing it, please wait for my patch.

[YiiGuxing]

@jhildenbiddle, The fact that the cover doesn't work in asynchronous mode on marked.js isn't due to this PR, it's the same problem on the develop branch: setting markdown: { async: true } will cause the cover and the sidebar to malfunction. The new commit ensures that the cover works properly, but there are still issues with the sidebar. The new commits also add support for embedding files in the cover and fix an issue where the doneEach hook might not be called.

Additionally, regarding the beforeEach and afterEach hooks for the cover, these hooks are called twice when the cover and the homepage are on the same page. Since we cannot intuitively determine the target of the hook within the hook function, I have not implemented them.