Get "Our Mission and Values" page across the finish line

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Description

The current live version of this page can be viewed here: https://distributeaid.org/our-mission/

#802 outlined the initial vision for this page.

File path: Path: content/pages/our-mission-and-values.md

Already done:

• Title on the page
• Text on the page

Must-haves to go public:

• Add this page to the navigation menu under "About Us"

Would-be-nices to go public:

• Get the banner image in Forestry CMS to show up on the top of the page so it's not so text heavy.
• Get the "image with caption" block that is supposed to go on the page to show up.

Not needed at this stage:

• N/A

Front end feature screenshots

From #802:

Code of Conduct

• I agree to follow this project's Code of Conduct