Update "About" Section text

[michelle-easter]

For blurb as introduction to "About" section (mission & vision statement), update text to say:

"Mind Makers' mission is to increase STEM potential for underserved adults and children, through education, outreach and awesome displays of tech teamwork. Our vision is to build a diverse, technology proficient community that values knowledge sharing, redefines possibility and inspires a new generation of engineering enthusiasts."