Provide an app shell to speed up bootstrapping / scaffolding

[zemirco]

Many web apps nowadays have very similar requirements when it comes to the layout.

Typically we build applications that have

• a main navigation on the left side
• a header with links, icons and some dropdowns (similar to what you currently see at github.com in the top right corner)
• the main content area
• a footer with required but maybe less focused information
• a breadcrumb

It would be nice to either have some kind of "AppShell" component or a full example that demonstrates how to use the existing components (breadcrumbs, header, sidenav, dropdown) together to build more complex web applications. You could maybe create a repo where that is already wired together that we as users could simply clone and then build our own applications on top of that.

All of that should be responsive and the main navigation on the left side should automatically disappear on smaller devices without having to click the collapse icon.

Here are two examples from other component libraries.

https://saas-ui.dev/docs/components/layout/app-shell#

https://mantine.dev/core/app-shell/