Driver: Add page about Raku

[amotl]

About

What the title says.

Preview

https://cratedb-guide--477.org.readthedocs.build/connect/raku/

[coderabbitai]

Walkthrough

Adds Raku driver documentation and registers it in the drivers index: a new docs/connect/raku/index.md page with examples, installation and CrateDB Cloud notes, plus a Raku card and raku/index entry in docs/connect/index.md's "Drivers by language" grid and toctree.

Changes

Cohort / File(s)	Change Summary
Drivers index update docs/connect/index.md	Inserted a new grid-item-card for Raku in the "Drivers by language" grid and added raku/index to the languages toctree/list.
New Raku driver documentation docs/connect/raku/index.md	Added a new Raku driver page: header image and muted intro, About (Protocol::Postgres), runnable Synopsis example, example file/instructions, shared fragment include (../_cratedb.md), CrateDB Cloud credential snippet, and install/run commands.

Sequence Diagram(s)

(omitted — documentation-only change; no control-flow modifications)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Driver: Add page about Rust #407: Adds a language driver card and toctree entry in docs/connect/index.md (similar index changes).
• Driver: Add page about Zig #419: Adds a language driver card and creates a corresponding docs/connect/<lang>/index.md page.
• Connect: Migrate pages from crate-clients-tools, to be retired soon #221: Earlier edits to the connect documentation structure and same docs/connect/index.md area.

Suggested labels

cross linking

Suggested reviewers

• seut
• matriv

Poem

🐰 I hopped through docs with nimble paws,
A Raku card now joins the cause,
Example code all set to run,
Connections made—oh what fun!
Carrots for commit and applause! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Driver: Add page about Raku' directly and clearly describes the main change - adding documentation for the Raku driver.
Description check	✅ Passed	The description references 'What the title says' and provides a preview link, which relates to the changeset of adding a Raku driver page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

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

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[bmunkholm]

I don't think we need to should add this (and similar minority languages) with their own page.
See comments https://github.com/crate/tech-content/issues/124#issuecomment-3484870195.

[amotl]

It is better to use Net::Postgres instead. Thanks @Leont.

• Full example for SSL/TLS connectivity Leont/protocol-postgres#3