Expand vision with general public focused content

[ElenaFdR]

@angelplasma's new publiccode.net website design calls for a prominent explanation of our vision to get visitors excited about/inspired by our mission.

Proposal:

• @brandmuse will craft short, accessible intro(s) to the vision and possible futures enabled by public code
• for people interested in more, we have the background, plus potentially more theoretical or academic content from @nebster