⚓ Refresh glossary categories and doc card formatting

[JFWooten4]

Adds richer DocCard metadata across generated index pages so category cards can carry useful descriptions instead of repeating the same explanatory text inside page bodies.

This PR:

• Adds a custom DocCard theme component that displays descriptions for doc and category cards
• Moves the Hubble bronze, silver, and gold explanations into category metadata
• Removes the duplicate inline Hubble category descriptions from the data dictionary index
• Adds descriptions for several Fundamentals categories:
  • Stellar Data Structures
  • Operations & Transactions
  • Smart Contracts
  • Data Format

Why

Generated index pages are more useful when the card itself explains where the link goes. This keeps landing pages cleaner while preserving the context users need before clicking through.

For the Hubble data dictionary, this also avoids repeating the same bronze, silver, and gold descriptions above cards that can now carry that metadata directly.

[Copilot]

Pull request overview

Note

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Adds a custom DocCard theme override so generated docs index cards can display rich descriptions sourced from doc/category metadata, reducing duplicate explanatory text on landing pages.

Changes:

• Introduces a custom @theme/DocCard implementation + styling that renders an optional description line on cards.
• Adds category-level descriptions (Fundamentals + Hubble bronze/silver/gold) via _category_.json.
• Removes duplicated inline bronze/silver/gold explanations from the Hubble data dictionary index page.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/theme/DocCard/styles.module.scss	Adds card styling and a clamped description block.
src/theme/DocCard/index.tsx	Implements custom DocCard rendering with descriptions for links/categories.
docs/learn/fundamentals/transactions/category.json	Adds category label/link and a description for index cards.
docs/learn/fundamentals/stellar-data-structures/category.json	Adds category label/link and a description for index cards.
docs/learn/fundamentals/data-format/category.json	Adds category label/link and a description for index cards.
docs/learn/fundamentals/contract-development/category.json	Adds category label/link and a description for index cards.
docs/data/analytics/hubble/data-catalog/data-dictionary/silver/category.json	Adds Hubble “silver” description for card metadata.
docs/data/analytics/hubble/data-catalog/data-dictionary/gold/category.json	Adds Hubble “gold” description for card metadata.
docs/data/analytics/hubble/data-catalog/data-dictionary/bronze/category.json	Adds Hubble “bronze” description for card metadata.
docs/data/analytics/hubble/data-catalog/data-dictionary/README.mdx	Removes duplicated bronze/silver/gold text now stored in metadata.

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[JFWooten4]