fix path to template when installed via npm

I'm not sure why, buy app-root-path was not picking up the correct
path for this module when installed via NPM. Since we're already using
relative paths for imports, I don't think we gain much from using it
anyway, so I've changed to using path.resolve instead

package.json

@@ -29,10 +29,8 @@
     "clippy"
   ],
   "dependencies": {
-    "@types/app-root-path": "^1.2.4",
     "@types/archiver": "^0.15.37",
     "@types/express": "^4.0.35",
-    "app-root-path": "^2.0.1",
     "archiver": "^1.3.0",
     "xml": "^1.0.1"
   },

ts/export/packer/packer.ts

@@ -1,5 +1,5 @@
-import * as appRoot from "app-root-path";
 import * as archiver from "archiver";
+import * as path from "path";
 import * as xml from "xml";
 import { Document } from "../../docx";
 import { Numbering } from "../../numbering";
@@ -8,6 +8,8 @@ import { Styles } from "../../styles";
 import { DefaultStylesFactory } from "../../styles/factory";
 import { Formatter } from "../formatter";
 
+const templatePath = path.resolve(__dirname, "../../../template");
+
 export abstract class Packer {
     protected archive: any;
     protected document: Document;
@@ -53,12 +55,12 @@ export abstract class Packer {
         this.archive.pipe(output);
         this.archive.glob("**", {
             expand: true,
-            cwd: appRoot.path + "/template",
+            cwd: templatePath,
         });
 
         this.archive.glob("**/.rels", {
             expand: true,
-            cwd: appRoot.path + "/template",
+            cwd: templatePath,
         });
 
         const xmlDocument = xml(this.formatter.format(this.document));