(#1335) Update Footer Overview Image and Guidance

[blilianyu]

Closes #1335

[github-actions[bot]]

Viewing Information

• The documentation site
• NCIDS JS Documentation
• The storybook site
• The example site

[blilianyu]

Looks great @dlescarbeau!!

Just one thing, can you update the first sentence to the following? I also highlighted it in the Word Doc.

The footer is a required element (although customizable) and can be found at the bottom of all pages on the website.

[adrianacastaneda]

Looks great! Thank you @dlescarbeau !