/p/_admin/overview allows raw HTML but the preview button sends it to markdown_to_html which isn't right. I think removing the preview button would be fine here.
To test, go to the neighborhood admin overview page and make sure the Home Content is an auto expand text box without a preview button. I also made the CSS field an auto expander.
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To test, go to the neighborhood admin overview page and make sure the Home Content is an auto expand text box without a preview button. I also made the CSS field an auto expander.
Merged to dev.