Google Material Design Lite has been retired and stylesheets aren't rendering

[phrdang]

When going to the seating tool website, stylesheets aren't rendering correctly:

This is because trying to get Google's Material Design Lite assets is responding with 403 Forbidden:

Which is because they have retired it according to: google/material-design-lite#5464

We need to find a replacement or workaround - cc @pancakereport @yanlisa @cycomachead

This issue was originally reported in DS Crossroads Slack: https://dscrossroads.slack.com/archives/C0144F6S152/p1770971527819819