Update question icon

[fanzeyi]

Fix #159

[fanzeyi]

@microsoft-github-policy-service agree

[hbons]

Thanks for your contribution! It seems that some circled icons that have centred content are intentionally offset to prevent blurriness at lower resolution screens. But there are also some circled icons that are properly centred. So these won't mix well when used together. We should come up with a solution that works for all these icons @daviddossett.

[troy351]

@hbons I also found trash icon which is not circled but not center aligned

[hbons]

Tracking in #243