[i18n] Add Bengali translation for blueprints documentation

[perashanid]

Motivation for the change, related issues

Continuing Bengali translation efforts for WordPress Playground documentation. This PR adds Bengali translations for three core blueprint documentation pages.

Implementation details

Translated the following files to Bengali:

• 01-index.md - Getting started with Blueprints (overview and introduction)
• 02-using-blueprints.md - How to use Blueprints (URL fragment, query parameter, bundles, JavaScript API)
• 03-data-format.md - Blueprint data format (JSON schema, landing page, preferred versions, features, steps)

All translations:

• Maintain the original structure and formatting
• Preserve all code examples, links, and technical terms
• Use accurate Bengali terminology for technical concepts
• Keep all interactive elements and import statements functional

Testing Instructions (or ideally a Blueprint)

1. Navigate to the Bengali documentation site when deployed
2. Verify the translated pages render correctly
3. Check that all links and code examples work as expected
4. Confirm Bengali text displays properly with correct Unicode characters
5. Test interactive Blueprint examples to ensure they function correctly

[Copilot]

Pull request overview

Adds Bengali (bn) translations for WordPress Playground “Blueprints” documentation pages, keeping structure, links, and embedded interactive examples consistent with the original docs.

Changes:

• Added Bengali “Getting started”, “Using blueprints”, and “Data format” pages under the bn i18n docs tree
• Included MDX BlueprintExample imports and example payloads for interactive rendering
• Localized descriptive text while preserving technical references and code samples

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/01-index.md	Adds Bengali translation for Blueprints getting-started landing page with interactive example
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/02-using-blueprints.md	Adds Bengali translation explaining URL fragment/query param/bundles/JS API usage with examples
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/03-data-format.md	Adds Bengali translation describing Blueprint schema and key properties with examples

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