Update ECD Tools mission statement and associated logo on the home page

Created by: croundy

Please update the text on the home page under "Mission Statement":

Replace "Mission Statement" with "Our Mission" and add text below to read:

To define and build an ecosystem of best-in-class, vendor-neutral open-source web and cloud-based development tools, and to promote and drive the broad adoption of these tools.

and please update the logo with this: