Just my landing with contact form included https://elgg.org/plugins/2439715
Drop the action and form from there and create your own plugin
Or https://elgg.org/plugins/1070975. If you don't like the contact form being named "Feedback", you would only need to rename the text in the language file(s) according to your needs.
Check it out this plugin.
https://elgg.org/plugins/1435018
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