Allow customization of the homepage (remove Harvard-specific content)

[PaulBoon]

The homepage displays 'Harvard’ as name of the archive and has links to the Harvard support page. Obviously this can not be deployed for an archive of another organisation. We could have variables for this that are used at build time.
Another option is to be able to switch the homepage of entirely.

[pdurbin]

Related:

• #794

[pdurbin]

Yes, I just noticed the Harvard-specific information when deploying to https://dev1.dataverse.org/spa/

Here's a screenshot:

Out of the box, we shouldn't show Harvard-specific information. That is, the Harvard installation should opt-in to Harvard-specific content.