fallback.js is causing scrolling issues on page load

lego has a "fallback.js" script that uses javascript to fallback to PNGs if SVG is not supported. i'm not sure it's useful since SVG support is 99%+ supported, and a user without SVG likely also has no javascript.

but the main issue is that at the end of the script there's code specific to support.tpo. When used on sites other than support.tpo, this snippet causes the viewport to scroll directly to the top of the page. this script is included in the default footer template, which is used in most of the sites. this means that most of our sites are loading, and then flinging users back to the very top of the page.

the end of this script needs to be moved to its own script in support, and we may want to consider removing the rest of the script (the actual fallback) altogether