add .dockerignore file

Ignore node_modules in build to prevent issue with COPY or bind mounts
when dependencies already exist on the host's filesystem

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

.dockerignore

@@ -0,0 +1,2 @@
+node_modules
+Dockerfile

src/static/js/app.js

@@ -53,7 +53,7 @@ function TodoListCard() {
         <React.Fragment>
             <AddItemForm onNewItem={onNewItem} />
             {items.length === 0 && (
-                <p className="text-center">You have no todo items yet! Add one above!</p>
+                <p className="text-center">No items yet! Add one above!</p>
             )}
             {items.map(item => (
                 <ItemDisplay