Investigate implication of "extended" Material icons library on build time/size

see !7 (comment 53622) of @paul-lorenc:

Note that I had to add the "Extended" Material Icon library, which there is a warning against doing because it bloats development library size. A better way would just to individually add the non-core icons we need but I couldnt easily figure out how to do that. The extended library says it will properly minify the assets for production so this only affects dev build time.