Add Spanish GIFs/PNGs for HOC 2019 and optimize many English and Spanish GIFs/PNGs

src/lib/libraries/decks/en-steps.js

src/lib/libraries/decks/es-steps.js

src/lib/libraries/decks/steps/add-backdrop.png

src/lib/libraries/decks/steps/add-effects.en.png

src/lib/libraries/decks/steps/add-effects.es.png

src/lib/libraries/decks/steps/add-sprite.es.gif

src/lib/libraries/decks/steps/add-sprite.gif

src/lib/libraries/decks/steps/add-variable.en.gif

src/lib/libraries/decks/steps/add-variable.es.gif

src/lib/libraries/decks/steps/animate-char-add-sound.en.gif

src/lib/libraries/decks/steps/animate-char-add-sound.es.gif

src/lib/libraries/decks/steps/animate-char-add-sound.es.png

...ib/libraries/decks/steps/animate-char-change-color.en.gif

...ib/libraries/decks/steps/animate-char-change-color.es.gif

...ib/libraries/decks/steps/animate-char-change-color.es.png

src/lib/libraries/decks/steps/animate-char-jump.en.gif

src/lib/libraries/decks/steps/animate-char-jump.es.gif

src/lib/libraries/decks/steps/animate-char-jump.es.png

src/lib/libraries/decks/steps/animate-char-move.es.gif

src/lib/libraries/decks/steps/animate-char-move.es.png