[patch] Do not load 3rd party resources

We loaded images and sounds from
https://blockly-demo.appspot.com/static/media/. With the GPDR in mind,
it is better to host everything yourself.

.gitignore

@@ -23,3 +23,5 @@ yarn-debug.log*
 yarn-error.log*
 
 .idea.*
+
+public/media/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "blockly"]
+	path = blockly
+	url = https://github.com/google/blockly

README.md

@@ -2,14 +2,15 @@
 
 ## Installation
 
-In the project directory, run `npm install`
+In the project directory, copy the media/ folder once like this: `cp -r blockly/media/ public/media`. Then run `npm install`.
 
 ## Build
 
 Assume we want to deploy the site to the path "/girlsday", then you can do:
 
 ```
 PUBLIC_URL="/girlsday" npm run build
+cp -r blockly/media/ public/media
 ```
 
 You can find the files to deploy in the build/ folder.

src/tasks/Task.js

@@ -303,7 +303,9 @@ export default function Task(props) {
                   <Col xs={7}>
                       <Row style={{height: "80vh"}}>
                           <BlocklyComponent ref={workspaceRef}
-                                            readOnly={false} trashcan={true}
+                                            readOnly={false}
+                                            trashcan={true}
+                                            media={process.env.PUBLIC_URL + "/media/"}
                                             move={{
                                                 scrollbars: true,
                                                 drag: true,