Use a monospaced front when editing NCIDS Mega Menu content blocks

[blairlearn]

Issue description

The "Yaml Content" field in ncids_mega_menu_content content blocks uses a proportional font. This makes it difficult to tell whether your text is in the correct column, and YAML is "persnickety" about indentation.

ESTIMATE TBD

What's the expected change?

• The "Yaml Content" field uses a monospaced font.

What's the current functionality?

• The field is using a proportional font.

What's the updated acceptance criteria?

Additional details / screenshot

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