New home page copy

[CoralineAda]

What does this PR accomplish?

• Refreshes our home page copy to more succinctly convey who we are and what we do.

Getting there

• Rewrote the copy based on suggestions from fundraising consultants
• Reordered the navigation narrative to what we do -> what we believe -> who we are

Notes for reviewers

• None

What's next

• A dedicated page for donors

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