Display most recently added collections on the homepage (v1.5)

[wrenaria]

This feature is part of Phase 1 of the DAMS v1.5 update (#33).

Dams v1.5 will display the most recently digitized collections on the homepage and move the display of all collections to their own dedicated browse page. See issue #(coming soon) for the Browse Collections page design. These two features must launch together.

The number of recently added collections will be limited to a max of 3, minimum of 2. The number displayed depends on the viewport width. Rules are:

• If there is room for 3 collections to display in a row, show 3 collections.
• If < 3 collections (2 or 1) display in a row, only show 2 collections.

Collection card placement rules follow the currently display rules on the DAMS site (320px square card, 30px space between them).

General homepage padding rules are in issue #33 (v1.5 Homepage Overview). Header should follow the same format as what's on the current DAMS About page.

The background is #F3F3F3 / super-light-background-color.

[EricNebeker]

@wrenaria @jrmerz @qjhart These are the schema.org options for 'recently digitized' that I found:

uploadDate: “Date when this media object was uploaded to this site”. [This looks like the best option to me] https://schema.org/uploadDate

dateCreated: The date on which the CreativeWork was created or the item was added to a DataFeed. [This one is a bit generic but could be appropriate. We currently don’t use it but it might be something we want to distinguish from datePublished in the future.]. https://schema.org/dateCreated

releaseDate: The release date of a product or product model. This can be used to distinguish the exact variant of a product. [We could probably get away with it on a technicality, but I think not a great option.] https://schema.org/releaseDate

datePosted: Publication date of an online listing. [This is meant for things like job boards, etc., so a bit of stretch.] https://schema.org/datePosted