You need to add the script provide in this gist to your Squarespace site using Code-injectin option and add the cde to the footer section.
This is a list element ( <ul> element in HTML) that you need to populate
Add your file to google drive, and then use "get Link" option to generate link. Please make sure that its readable by anyone with access to link.
The below code shows an exmaple where its targetting a ul list and adding links to it dynamically from a csv where where we have two columns. Name and link. The name contains the display name of the item and the link column contains the url