Developer docs need updating

[neoformit]

This font no longer exists in https://github.com/google/material-design-icons/tree/master/font:

Can these docs please be updated, as the above results in a build error:
https://developers.google.com/fonts/docs/material_icons#setup_method_2_self_hosting

EDIT - these also do not exist:

    url(/static/vendor/material-icons/font/MaterialIcons-Regular.woff2) format('woff2'),
    url(/static/vendor/material-icons/font/MaterialIcons-Regular.woff) format('woff'),

[tphinney]

That doc should also be updated to point out that Material Icons has not been updated in recent years, and Material Symbols is the current icon font from Google.