Revert "(chore): remove material icons from main css bundle"

This reverts commit bac5ec87.

angular.json

@@ -21,6 +21,7 @@
             "styles": [
               "node_modules/material-design-lite/dist/material.blue_grey-amber.min.css",
               "node_modules/plyr/dist/plyr.css",
+              "node_modules/material-design-icons/iconfont/material-icons.css",
               "src/main.css"
             ],
             "scripts": [