fix: run yarn locally

npm/install.js

@@ -143,7 +143,7 @@ const tasks = {
    */
   installYarn() {
     ora.text = 'Installing Yarn...'
-    return exec.stdout('npm', ['install', '-g', 'yarn'], {
+    return exec.stdout('npm', ['install', 'yarn'], {
       cwd: installDir
     }).then(results => {
       ora.text = 'Yarn installed successfully.'
@@ -155,7 +155,7 @@ const tasks = {
    */
   installDependencies() {
     ora.text = 'Installing Wiki.js npm dependencies...'
-    return exec.stdout('yarn', ['install', '--production', '--ignore-optional'], {
+    return exec.stdout('./node_modules/.bin/yarn', ['install', '--production', '--ignore-optional'], {
       cwd: installDir
     }).then(results => {
       ora.text = 'Wiki.js npm dependencies installed successfully.'

npm/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "wiki.js",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "lockfileVersion": 1,
   "dependencies": {
     "amp": {

npm/package.json

@@ -1,6 +1,6 @@
 {
   "name": "wiki.js",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "A modern, lightweight and powerful wiki app built on NodeJS, Git and Markdown",
   "main": "install.js",
   "scripts": {