Edit text on "Who We Are"

[gwalsh311]

Change text to:

"Digital Credential Consortium members are non-profit or state-funded higher education or postgraduate education institutions from around the world on a mission to create a trusted, distributed, and shared infrastructure that will become the standard for issuing, storing, displaying, and verifying academic credentials, digitally.

The DCC is led by a Leadership Council elected by the DCC membership and is supported by a team of professionals."

[fields37]

Updated in https://github.com/digitalcredentials/dcc-website-jekyll/pull/12/commits/25972a5b3c1530ba012c899160d49712704bfce1, reviewable here

[kayaelle]

Looks good.