Merge pull request #641 from noesya/feature/blocks_chapter_layouts

.../images/communication/blocks/templates/call_to_action.jpg

app/assets/images/communication/blocks/templates/chapter.jpg

...munication/blocks/templates/chapter/accent_background.png

...communication/blocks/templates/chapter/alt_background.png

.../communication/blocks/templates/chapter/no_background.png

app/assets/images/communication/blocks/templates/contact.jpg

...ssets/images/communication/blocks/templates/datatable.jpg

...ets/images/communication/blocks/templates/definitions.jpg

...assets/images/communication/blocks/templates/diplomas.jpg

app/assets/images/communication/blocks/templates/embed.jpg

app/assets/images/communication/blocks/templates/files.jpg

app/assets/images/communication/blocks/templates/gallery.jpg

...mages/communication/blocks/templates/gallery/carousel.png

...ts/images/communication/blocks/templates/gallery/grid.png

app/assets/images/communication/blocks/templates/image.jpg

...ets/images/communication/blocks/templates/key_figures.jpg

...ges/communication/blocks/templates/organization_chart.jpg

app/assets/images/communication/blocks/templates/pages.jpg

...ets/images/communication/blocks/templates/pages/cards.png

...sets/images/communication/blocks/templates/pages/grid.png