[Sprint/NuancedNumbat](fix): Do not show post if deleted.

Closes #1732 (closed)

I believe this to be the correct way to take care of it, as the remaining line after deletion caused by border offers an indicator of where the post was. Can be taken care of if anybody disagree's - easy enough to add conditional css but I left it in because it felt better to me.

It appears that the _deleted event emitter is not implemented properly, but I don't feel deferring 'deletion' to the parent is the correct solution anyway.

Note in the HTML file, all I have done is wrapped it in an ng-container conditionally tied to whether the post is in a deleted or not. The large amount of changes come from adjusting the indentation.