[i18n] Add Bengali translation for blueprints tutorial pages

[perashanid]

Motivation for the change, related issues

Continuing Bengali translation efforts for WordPress Playground documentation. This PR adds Bengali translations for two important blueprint tutorial pages.

Implementation details

Translated the following files to Bengali:

• 02-how-to-load-run-blueprints.md - Explains how to load and run blueprints using URL fragments, Base64 encoding, and blueprint-url parameter
• 03-build-your-first-blueprint.md - Step-by-step tutorial for building a first blueprint including installing themes, plugins, and importing content

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 (Run Blueprint buttons) 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

[Copilot]

Pull request overview

Adds Bengali (bn) localized documentation pages for the WordPress Playground Blueprints tutorial and related guide content.

Changes:

• Added Bengali translations for Blueprints 101 landing page and tutorial chapters.
• Added Bengali translation for the “providing content for your demo” guide.
• Preserved existing examples/links while localizing surrounding explanatory text.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/main/guides/providing-content-for-your-demo.md	Adds bn translation of the “providing content” guide, including blueprint step examples.
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/tutorial/index.md	Adds bn landing page for “Blueprints 101” tutorial with nav links.
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/tutorial/03-build-your-first-blueprint.md	Adds bn translation of “Build your first blueprint” chapter with multiple runnable examples.
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/tutorial/02-how-to-load-run-blueprints.md	Adds bn translation of “How to load and run blueprints” chapter.
packages/docs/site/i18n/bn/docusaurus-plugin-content-docs/current/blueprints/tutorial/01-what-are-blueprints-what-you-can-do-with-them.md	Adds bn translation of “What are blueprints?” chapter.

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