fix(collection): wrap intro text in a div, not a p

[Vidminas]

The collection block's intro text is rendered markdown (RenderString), which can be block-level (multiple paragraphs). Wrapping it in <p> is invalid — the inner block <p>s force the outer <p> closed, so any wrapper styling escapes.

🚀 What type of change is this?

• 🐛 Bug fix (A non-breaking change that fixes an issue)
• ✨ New feature (A non-breaking change that adds functionality)
• 💅 Style change (A change that only affects formatting, visuals, or styling)
• 📚 Documentation update (Changes to documentation only)
• 🧹 Refactor or chore (A code change that neither fixes a bug nor adds a feature)
• 💥 Breaking change (A fix or feature that would cause existing functionality to not work as expected)

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🎯 What is the purpose of this change?

The collection block wraps its intro text in a <p>, but text is rendered markdown
(RenderString) and can be block-level (multiple paragraphs). A <p> may only contain inline
content, so the inner block <p>s force the outer <p> closed and any wrapper styling escapes.

Before (main), with a two-paragraph intro:

<p><p>Para one.</p>
<p>Para two block output.</p>
</p>

After:

<div><p>Para one.</p>
<p>Para two block output.</p>
</div>

Fix. Use a <div>. This is exactly what the markdown block already does
(blox/markdown/block.html), including a comment explaining it supports the prose class and
multiple paragraphs — so this just brings the collection block in line with its sibling.

Verified on the academic-cv starter with a temporary two-paragraph collection intro: the fixed
build nests the paragraphs inside a <div>; the same content on main produced the invalid
<p><p>…</p><p>…</p></p>.

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📸 Screenshots or Screencast (if applicable)

n/a — invalid-HTML fix; see the before/after markup above.

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ℹ️ Documentation Check

• No, this change does not require a documentation update.
• Yes, I have updated the documentation accordingly (or will in a follow-up PR).

---

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[github-actions]

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[github-actions]

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[Vidminas]

This is still relevant, keep open ^