Made parcel build work and created a makefile so I don't need to repeat

steps each build

Makefile

@@ -0,0 +1,13 @@
+entrypoint=index.html
+
+postbuild: build
+	node postbuild.js
+
+build: node_modules
+	parcel build ${entrypoint}
+
+node_modules:
+	npm install
+
+clean:
+	git clean -xdf

src/GraphicsBlog.jsx

@@ -10,7 +10,7 @@ import {
   Typography,
   Button,
   List,
-  ListHeader,
+  ListSubheader,
   ListItemIcon,
   ListItem,
   Link,
@@ -78,9 +78,9 @@ class GraphicsBlog extends Component {
                 windows and OpenGL to render the meshes.
               </Typography>
               <List dense>
-                <ListHeader>
+                <ListSubHeader>
                   To Do:
-                </ListHeader>
+                </ListSubHeader>
                 <ListItem>
                   <ListItemIcon><ArrowRightIcon /></ListItemIcon>
                   Give meshes their own relative location.