refactor: update all reusable fontWeights

src/components/Repository/styles.ts

@@ -5,10 +5,11 @@ import Typography from '@material-ui/core/Typography';
 
 import Github from '../../icons/GitHub';
 import colors from '../../utils/styles/colors';
+import { fontWeight } from '../../utils/styles/sizes';
 
 export const Heading = styled(Typography)({
   '&&': {
-    fontWeight: 700,
+    fontWeight: fontWeight.bold,
     textTransform: 'capitalize',
   },
 });