api-docs: remove unused font dependency

Signed-off-by: Johan Haals <johan.haals@gmail.com>

plugins/api-docs/package.json

@@ -37,7 +37,6 @@
     "@backstage/plugin-catalog": "^0.7.0",
     "@backstage/plugin-catalog-react": "^0.5.2",
     "@backstage/theme": "^0.2.10",
-    "@material-icons/font": "^1.0.2",
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "4.0.0-alpha.57",