Day 10: Accessibility improvements

We made a number of changes in #Tusky 22.0 to improve accessibility

Some users reported that the design of the "Load more" break made it difficult to spot amongst other posts in a timeline.

@lakoja updated the design so that it is more visually distinctive in https://github.com/tuskyapp/Tusky/pull/3376.

The swipe-to-refresh gesture is not always accessible to assistive devices. I added an accessible "Refresh" menu entry as an alternative in https://github.com/tuskyapp/Tusky/pull/3121.