Point people to contact form for demos

[armchairlinguist]

We had an item to email support for a demo, but support doesn't do demos typically, so this updates to send them to the regular contact form.

Feel free to verify with Sales if this is the best option (unsure if they can formally SME-review this).

Please ensure

• [ ] A subject matter expert (SME) reviews the content
• [ ] A technical writer reviews the content or PR

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[khorne3]

@armchairlinguist I'll follow-up with sales and update this PR accordingly