Revise TX Overview Image

* Replace previous TX Overview image with a simplified illustration.
  The previous overview image was commented out in pull #566 / commit
  6afc683.  New image incorporates suggestions by @saivann (thanks!)

* Add new illustration showing the specifics of outputs and inputs (and
  how they're related). This replaces most of the detail lost by using a
  simplified overview image

* Add two short paragraphs briefly describing the ouput and input
  features, leading into the existing detailed P2PKH description
Link to the GitHub release page from the download page (fixes #591) (thanks @TheBlueMatt @harding)
Merge branch 'tx-overview-image' (pull #581)
Link Dust Limit (546 sat) To Bitcoin Core Commit 614c196 (closes #592)
Add Copay wallet