Update about page

[oscgonfer]

The about page is very outdated and I think it's time to update it.

I would leave room for the contributors, collaborators and goteo initial campaign that it's there currently, but would keep content in a more minimal way, and add more valuable material that really shows what the project is currently doing.

Things to do:

• Fix overlaying banner
• Add a better copy at the top with updated logos
• Decide what to do with legacy material. I wouldn't delete it, but I would make it more minimal
• Add material for values, projects, numbers and contributors
• Add a link to the about page in the landing and/or the footer

A great inspiration can be found here: https://www.asyncapi.com/about and here https://www.blender.org/about/