[board] updated Dana and David's role email addresses

[Jim Lawson]

I've updated Dana and David's email addresses for their board group roles:
outreach -> danapepp at gmail.com
secretary -> davidepotovsky at gmail.com
Please remember to "Reply All" to any email sent to your group, and if you want to send an official email from your personal address, please ensure that you "Cc" the group role:
 Dana -> cc outreach at marinbees.org
 David -> cc secretary at marinbees.org