PageFragment: scroll to top on new page

Fixes an issue where new pages sometimes are shown at the position of
the previous page instead of from their start.

app/src/main/java/dev/lowrespalmtree/comet/PageFragment.kt

@@ -134,6 +134,7 @@ class PageFragment : Fragment(), PageAdapter.Listener {
                 binding.addressBar.setTextColor(resources.getColor(R.color.url_bar_loading, null))
             }
             PageViewModel.State.RECEIVING -> {
+                binding.contentRecycler.smoothScrollToPosition(0)
                 binding.contentSwipeLayout.isRefreshing = false
             }
         }