More doc fixes [PATCH]

[Antoni Bella Pérez]

  Hi,

  I have made some changes and improvements included in the attached file.

  Remove unused screenshots (your choice):
    - using-sidebar-metadataexif.png
    - using-mainwindow-advsearch.png
    - using-camera-download.png
    - using-camera-targetalbumdialog.png

  Regards
  Toni
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