Update links on wmo.org/design

[cassiemc]

Would love some help documenting what could be better about build.webmaker.org/design Here's a QA checklist if it's handy: https://github.com/MozillaFoundation/Design/issues/15#issuecomment-125954223

This would be a great bug for a first contributor to help us identify areas where we can improve the site.

[cassiemc]

I would still love to check all the links on the site. I admittedly have not done that, and I'll take responsibility for it.

[cassiemc]

I haven't done anything this week yet but should be doable.

[cassiemc]

There are a number of improvements and corrections to make on this page. Going to roll this issue over to the next heartbeat and assign to @vazquez for updating.

• [x] The 'Let us know' text link should point to: mofo-design@mozillafoundation.org
• [x] Under 'Principles', add to the description:

  "This work is ongoing – get involved!"

• [x] Under 'templates and guidelines', let's change the title to just 'Templates'

• [x] Under 'templates and guidelines', let's replace the copy that is there, updating copy and links to:

  Standards and kits for incorporating new work into existing projects. Access our templates for annotating designs, creating social share graphics, or building upon the Webmaker UI.

• [x] Under 'assets' remove the link to 'Illustration'. So the first sentence should read:

  Logos, fonts, colours and photography.

• [x] Under 'assets', add this to the end of the first sentence.

  Access working design files for all of Mozilla Foundation's projects.

• [x] Under 'Process', let's update description and links to:

  Learn more about how we work. Use our design brief template and read about how we relish working with design contributors.

That should be it for now!