Updated alignment on detail page.

Author and date metadata appeared misalinged on the story detail
page, which was caused by the hover-editable UI. Since that doesn't
really seem to work, I removed it and instead made the form toggle
a button to the right of the title.

Change-Id: I5b7cea4479749e6c1a1f43a3032d81001c3bee66
Merge "Updated alignment on detail page."