Create metadata and highlighting for 'Web Technologies' examples (6.7)

Documentation: https://doc-snapshots.qt.io/qt6-6.7/qtexamplesandtutorials.html#web-technologies

In Qt Creator:

HTTP Client *, Qt WebChannel Standalone Example *, Qt WebView Examples - Minibrowser *, Recipe Browser *, Simple HTTP Server *, WebEngine Quick Nano Browser *, WebEngine Widgets Simple Browser Example *
Qt Quick Demo - RSS News, Qt WebChannel ChatClient HTML Example, Qt WebChannel ChatClient QML Application, Qt WebChannel ChatServer Example, RESTful API Server, WebEngine Content Manipulation Example, WebEngine Cookie Browser Example, WebEngine Lifecycle Example, WebEngine Notifications Example, WebEngine Push Notifications Example, WebEngine Widgets Client Certificate Example, WebEngine Widgets Html2Pdf Example, WebEngine Widgets Maps Example, WebEngine Widgets PrintMe Example, WebEngine Widgets Spellchecker Example, WebEngine Widgets Video Player Example

*: highlighted