Clean up social icons

[stephaniehobson]

There are now two copies of the "social" "icons". Some of these are the logos of social media networks and some of them are company/product logos. And the Firefox ones are out of date.

Things that need to be sorted out:

• where do these live?
• do we need to duplicate the company/product logos into this directory?
  • if yes:
  • the firefox one needs to be replaced by the master brand
  • the browser one needs to be added
  • other products need to be added

[stephaniehobson]

I am leaning towards not having the company/product logos duplicated into the social directory. Black and white "flat" versions will be available in the logos folders with #36.

[stephaniehobson]

And I am leaning towards keeping the social media icons in the icons folder instead of keeping the root ones.

[stephaniehobson]

Fixed in #36