Provide a single text field (editable through admin panel) w/o using a whole model

I'd like to have the content of one <p> tag in the homepage editable in admin back-office, going through a whole model feels like an overkill, what alternatives do I have ?

If there's no alternative, is there a way to properly limit the number of elements to 1 in the admin panel ?

Any help appreciated, I'm sure I missed something obvious because it seems like a basic need. (I'm new to django if u didn't catch it !)

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