Add sidebar helper for default credentials for wasm example

[AlixANNERAUD]

This pull request introduces several improvements to the WASM example, including a new sidebar UI for displaying default credentials, the addition of related assets and styles, and some minor codebase enhancements. The most significant changes are the addition of a toggleable sidebar in the example HTML, the creation of a dedicated CSS file for styling, and minor improvements to error handling and file system hierarchy.

WASM Example UI and Assets:

• Added a sidebar to index.html that displays default credentials, includes a toggle button with arrow icons, and links to the project website. The sidebar uses a new toggle script and references new image and CSS assets.
• Introduced a new styles.css file with custom styles for the sidebar, toggle button, and overall page appearance, leveraging Google Fonts and consistent color schemes.

File System and Error Handling Improvements:

• Added Path::NETWORK_DEVICES to the default virtual file system hierarchy in hierarchy.rs, ensuring this path is created by default.
• Improved error handling in the settings UI creation by propagating errors instead of panicking, making the code more robust.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
executables/settings/src/settings.rs	0.00%	1 Missing ⚠️

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