Deprecate createParagraph in all demos

demo/demo27.ts

@@ -1,32 +1,44 @@
 // Custom styles using JavaScript configuration
 // Import from 'docx' rather than '../build' if you install from npm
 import * as fs from "fs";
-import { Document, Packer } from "../build";
+import { Document, HeadingLevel, Packer, Paragraph } from "../build";
 
 const doc = new Document();
 const myStyles = doc.Styles;
 
 // The first argument is an ID you use to apply the style to paragraphs
 // The second argument is a human-friendly name to show in the UI
-myStyles.createParagraphStyle("myWonkyStyle", "My Wonky Style")
+myStyles
+    .createParagraphStyle("myWonkyStyle", "My Wonky Style")
     .basedOn("Normal")
     .next("Normal")
     .color("990000")
     .italics()
-    .indent({left: 720})  // 720 TWIP === 720 / 20 pt === .5 in
-    .spacing({line: 276});  // 276 / 240 = 1.15x line spacing
+    .indent({ left: 720 }) // 720 TWIP === 720 / 20 pt === .5 in
+    .spacing({ line: 276 }); // 276 / 240 = 1.15x line spacing
 
-myStyles.createParagraphStyle("Heading2", "Heading 2")
+myStyles
+    .createParagraphStyle("Heading2", "Heading 2")
     .basedOn("Normal")
     .next("Normal")
     .quickFormat()
-    .size(26)  // 26 half-points === 13pt font
+    .size(26) // 26 half-points === 13pt font
     .bold()
     .underline("double", "FF0000")
-    .spacing({before: 240, after: 120});  // TWIP for both
+    .spacing({ before: 240, after: 120 }); // TWIP for both
 
-doc.createParagraph("Hello").style("myWonkyStyle");
-doc.createParagraph("World").heading2(); // Uses the Heading2 style
+doc.addParagraph(
+    new Paragraph({
+        text: "Hello",
+        style: "myWonkyStyle",
+    }),
+);
+doc.addParagraph(
+    new Paragraph({
+        text: "World",
+        heading: HeadingLevel.HEADING_2,
+    }),
+); // Uses the Heading2 style
 
 const packer = new Packer();