Make background white again

[marcoambrosini]

Is your feature request related to a problem? Please describe.

No response

Describe the solution you'd like

I think we should go back to a white background. Looks better and it's consistent with other nextcloud apps

Now:

Proposed change:

Describe alternatives you've considered

No response

Additional context

No response

cc @raimund-schluessler @jakobroehrl @nextcloud/designers

[raimund-schluessler]

I think it looks better with the light gray background. It also gives a bit more contrast to the tasks.

[marcoambrosini]

@raimund-schluessler I don't think that that contrast is needed. The page is easily readable without a gray background, and I think it doesn't make much sense that we have this in only this one app.
@nextcloud/designers ping again, what do you think?

[szaimen]

I also think that white background is cleaner. What about making this configurable if we cannot agree on it?