Make it easier to find components

[cintek]

We are implementing an application with Flowbite-svelte and after a long time we found out in the documentation that there is a Radio Button available which we implemented ourselves before we found it. It would be time-saving if such components would be easier to discover. In this case I would expect a hint in the documentation for the Button Group.

Maybe add a section like "See also" to the pages in the documentation to link related components.