[Toaster] [review-request] bbarrosp/7743

[Barros Pena, Belen]

Patches for 

https://bugzilla.yoctoproject.org/show_bug.cgi?id=7743

56243c273264453e0663ae1eeb5eaa38b354bfc3
bitbake: toastergui: change image in landing page

7ff1dcac724ce7d3299b394b4a6b81546fba98d5
bitbake: toaster: new Toaster image

579e9b314238c3160e818d7791c27a1f0a4c0ffd
bitbake: toastergui: remove old screenshots


Thanks

Belén