feat: add made-in-romania collection

[spinualexandru]

Please confirm this pull request meets the following requirements:

• I followed the contributing guidelines: https://github.com/github/explore/blob/main/CONTRIBUTING.md.
• This change is not self-promotion.

Which change are you proposing?

• Suggesting edits to an existing topic or collection
• Curating a new topic or collection
• Something that does not neatly fit into the binary options above

Curating a new topic or collection

• I've formatted my changes as a new folder directory, named for the topic or collection as it appears in the URL on GitHub (e.g. https://github.com/topics/[NAME] or https://github.com/collections/[NAME])
• My folder contains a *.png image (if applicable) and index.md
• All required fields in my index.md conform to the Style Guide and API docs: https://github.com/github/explore/tree/main/docs

Currently, there is no collection for repositories Made in Romania 🇷🇴

[Copilot]

Pull request overview

This PR adds a new "Made in Romania" collection to GitHub Explore, highlighting open source repositories with strong ties to Romania.

Changes:

• Introduces a new collection definition at collections/made-in-romania/index.md listing Romanian-related repositories and a short description.
• Adds a corresponding collection image made-in-romania.png used as the visual thumbnail for the collection.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
collections/made-in-romania/index.md	Defines the "Made in Romania" collection, including its items list, display name, and descriptive text following existing collection conventions.
collections/made-in-romania/made-in-romania.png	Provides the PNG image asset referenced by the new collection metadata.

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