update website text

[danbjoseph]

• Text in several places on the site needs to be adapted to better represent the expanding scope of the project and additional project type(s).
• Language should be updated to be more inclusive of a global community. Text such as "Help humanitarians find and help vulnerable people" removes agency/dignity from the communities we seek to support.

Related:

• Change the call to action for 'request an area to be mapped' #8
• Change the call to action for 'join or host an event' #7