Allow setting preferred framework using query parameter

[abdullahtellioglu]

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In Copilot, there is a documentation plugin that fetches and loads the HTML content of the selected component page and displays the HTML inline. Documentation relies on code most often so displaying example codes in the Copilot would be a nice feature to have. The problem about displaying the code examples is that we are unable to set the framework.

A solution would be setting the preferred framework from the query parameter that initialize documentation with the given query parameter. Something like https://vaadin.com/docs/latest/components/icons?code=flow or https://vaadin.com/docs/latest/components/icons=react or https://vaadin.com/docs/latest/components/icons=lit