"New Tab"-page with a selection screen

[erri120]

Part of #674.

The "New Tab"-page now shows a dynamic selection screen with pages that the user can view.

out.mp4

[codecov]

Codecov Report

Merging #768 (7ff6615) into main (f699d8e) will decrease coverage by 0.53%.
Report is 2 commits behind head on main.
The diff coverage is 1.67%.

@@            Coverage Diff             @@
##             main     #768      +/-   ##
==========================================
- Coverage   62.80%   62.28%   -0.53%     
==========================================
  Files         610      612       +2     
  Lines       18456    18575     +119     
  Branches     1302     1303       +1     
==========================================
- Hits        11591    11569      -22     
- Misses       6520     6664     +144     
+ Partials      345      342       -3     

Flag	Coverage Δ
Linux	61.56% <1.67%> (-0.57%)	⬇️
Windows	61.50% <1.67%> (-0.51%)	⬇️
clean_environment_tests	62.26% <1.67%> (-0.53%)	⬇️
network_tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
.../NexusMods.App.UI/Controls/Dummy/DummyViewModel.cs	0.00% <ø> (ø)
...tContent/LoadoutGrid/LoadoutGridDesignViewModel.cs	92.59% <ø> (ø)
...I/RightContent/LoadoutGrid/LoadoutGridViewModel.cs	64.51% <ø> (ø)
src/NexusMods.App.UI/Services.cs	98.40% <100.00%> (+0.01%)	⬆️
...Mods.App.UI/WorkspaceSystem/Page/APageViewModel.cs	100.00% <100.00%> (ø)
...usMods.App.UI/WorkspaceSystem/Page/IPageFactory.cs	0.00% <0.00%> (ø)
src/NexusMods.App.UI/WorkspaceSystem/Page/Page.cs	0.00% <0.00%> (ø)
...pp.UI/WorkspaceSystem/Page/PageDiscoveryDetails.cs	0.00% <0.00%> (ø)
...UI/WorkspaceSystem/NewTabPage/NewTabPageFactory.cs	0.00% <0.00%> (ø)
...aceSystem/NewTabPage/NewTabPageSectionViewModel.cs	0.00% <0.00%> (ø)
... and 9 more

... and 14 files with indirect coverage changes