Logo html for an Outlook email signature

Site URL: https://www.nafrox.com

My client would like me to design an email signature for his new business. I've been told that using html (for both text and the logo / banner etc.) is ideal as it keeps the quality high and doesn't pixelate. I've also been told that I should upload the logo / banner that I want to use in the email signature to the website (without it appearing on the site), get the html for it, and insert it into the code in Outlook. I am a print designer, so this all sounds very tricky to me! But basically, I'd like to ask if this is possible in Squarespace? And if so, how can it be done? I don't want the logo / banner to actually appear on the website.
Any assistance would be much appreciated!

hi, i'm doing this at the moment.

Basically you just create an "unlinked" page in the website, so it exists but there's no navigation to it.

Then add images to that page, and once saved right click the image and choose "copy image address" and use this address as the image src.