No homepage set by default

[dynamiquel]

For first installs, it seems that no homepage is set. Resulting in just emptyness. Not sure if this is intended.

[lk-code]

In fact, there is currently no start page because I have not yet been able to decide on a page. But now I have a good idea, which I will implement as the default startup page.

https://dev.azure.com/lk-code/gamebar-browser/_workitems/edit/203