Run demo GitHub Action in parallel (#2484)

* Run demo GitHub Action in parallel

* Fix path of action yml

* Move checkout to demo action

* Prettier format

* Specifying shell

* Try to fix uses

* Fix spelling issue

* Fix demo

* Downloading artifacts too unreliable

Building instead

* Re-name step

Re-use action elsewhere

demo/64-complex-numbering-text.ts

@@ -107,5 +107,5 @@ const doc = new Document({
 
 // Used to export the file into a .docx file
 Packer.toBuffer(doc).then((buffer) => {
-    fs.writeFileSync("6-numbering.docx", buffer);
+    fs.writeFileSync("My Document.docx", buffer);
 });