feat(markdown): don't create excerpt if there is no <!--more-->

[Qwertovsky]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

If there is no <!-- more --> divider in the text then the excerpt is a copy of full content.

This change adds new boolean variable excerptIsBody into the document next to excerpt.

• It can help to improve performance and don't process the excerpt (just make a copy of body).
• It can help to don't show link to full text if there is nothing to read more.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[Atinux]

What about making the excerpt empty instead to avoid double payload?

[farnabaz]

Instead of having an extra field in the document, we should clear the excerpt value.

It also reduces the document sizes and smaller content chunks.

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[Qwertovsky]

I made changes. Now the excerpt is undefined.

By default, <ContentRenderer> still shows body.

    // Get body from value
    let body = (value.body || value) as MarkdownNode
    if (ctx.excerpt && value.excerpt) {
      body = value.excerpt
    }

But this PR could be breaking change for some cases. If the excerpt is used as content property in code.