feat(docs): add expandable summaries to collections table

[monssefbaakka]

This PR enhances the Docusaurus Collections overview page (docs/getting-started/collections.md) by displaying the richer, detailed descriptions from each *.collection.md file without requiring users to navigate away from the table.

Changes Made

• New React Component (CollectionsTable): Replaced the static markdown table with a Docusaurus-native React component that renders the collection metrics along with a <details> expandable row.
• Data Extraction Script: Added a Node.js utility (scripts/extract-collection-summaries.js) to parse the first paragraph/frontmatter description from all collections/*.collection.md files.
• Shared Data Store: Generated an initial collectionData.json artifact using the extraction script to serve the expanded rows. This keeps the overview table perfectly in sync with the source truth of each collection doc.

How to Test

1. Run npm install and npm run start in the docs/docusaurus/ directory.
2. Navigate to the Topics > Get Started > Collections Overview page.
3. Verify that the layout remains consistent but now features an expandable "View details" row beneath each table entry containing the full summary.
4. Check that running node scripts/extract-collection-summaries.js successfully repopulates the JSON store if any changes are made to the markdown files.

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