Refresh FAQs on Sparkplug website

As part of the Sparkplug compatibility program launch, we need to update the FAQs on the website. The link below is a draft document used for this purpose. Once complete we will update the issue. In the meantime, this is meant as a placeholder for resource planning and awareness. https://docs.google.com/document/d/1UC4z4jNCwDzVCBII4AkNhrhSBWE-j0REJEjTXMLYlcw/edit#heading=h.m0slcjc014to

@fdesbiens for your awareness

Checklist:

• FAQ updated by community
• Copy edited by @jharrisj1m
• Webdev issue created: https://gitlab.eclipse.org/eclipsefdn/it/websites/sparkplug.eclipse.org/-/issues