added new example in gallery.json

[schauppi]

Why are these changes needed?

This Pull Request proposes the addition of a new project, the Multimodal Web Agent, to the AutoGen gallery. Developed using AutoGen and OpenAI's Assistants API, this project represents a significant leap forward in autonomous web browsing technologies.

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• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[schauppi]

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[cemtu]

Thanks for adding the link!