implement a modern footer

[ghwood]

The footer currently contains a mix of links of different types, including links to affiliated sites, a link to a part of the main site, and a link to key legal information.

This mix of link types has no apparent organizational coherence, making expectations about what the viewer ought to find there or where the links will lead them. For example, it is unclear that “IRTF” leads to an entirely different website.

Also, the footer does not currently contain information and items that are commonly included in current webpage footer areas. Examples of these include copyright information, links to social media channels, and a summary version of a sitemap.

A modern approach to the footer section would allow for more of the commonly accepted links and information (social media and copyright), clearer organization of information and links, and greater context for links that would benefit from that.

A full specification for how this will be implemented is yet to be developed