Driver: Add page about Dart

[amotl]

About

What the title says.

Preview

https://cratedb-guide--414.org.readthedocs.build/connect/dart/

[coderabbitai]

Walkthrough

This pull request adds Dart language support to the CrateDB documentation by introducing a new driver card in the connectivity index and creating a comprehensive documentation page with connection examples, SSL configuration details, and usage patterns.

Changes

Cohort / File(s)	Summary
Dart Driver Documentation Index docs/connect/index.md	Added Dart language grid-item-card with link and styling, plus toctree entry pointing to new dart/index documentation
Dart Driver Guide docs/connect/dart/index.md	New documentation page covering Dart/PostgreSQL connection setup, including pubspec.yaml configuration, connection examples, SSL usage, and reference to CrateDB-specific details

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• #407: Adds Rust driver card and documentation page following the same pattern as this Dart addition
• #405: Adds a language driver page and updates docs/connect/index.md with grid-item-card and toctree entry using identical structure
• #408: Adds another language driver card and documentation page with the same methodology

Suggested labels

cross linking

Suggested reviewers

• surister
• matriv

Poem

A rabbit hops through code so bright, 🐰
Dart documentation, clean and right,
With drivers linked and examples keen,
Connections flow—a snappy scene! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Driver: Add page about Dart' clearly and concisely describes the main change: adding documentation about the Dart driver.
Description check	✅ Passed	The description, while brief, is directly related to the changeset by confirming the addition of a Dart driver documentation page and providing a preview link.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dart

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[kneth]

Let's discuss https://github.com/crate/tech-content/issues/124#issuecomment-3485676563 before merging