The site logo, favicon and navigation menu icons can be customized by replacing the corresponding SVG files in the _data/site.json file:
Logo
Replace brand.svg with your own SVG file and update the path if necessary.
"logopath": "partials/svg/brand.svg"
Favicon
Replace favicon with your own favicon file and update the path if necessary.
"faviconPath": "/assets/favicon/brand.svg"
Navigation menu icons
You can customize the navigation menu icons by replacing the corresponding SVG files:
"openMenuPath": "partials/svg/open-menu.svg",
"closeMenuPath": "partials/svg/close-menu.svg"
Social menu icons
You can customize the social menu icons. See the post Navigation menu for more information.