Update new project template name

Author: chenglou

pages/docs/manual/latest/installation.mdx

@@ -17,8 +17,8 @@ npm install -g bs-platform
 ## New Project
 
 ```sh
-git clone https://github.com/rescript-lang/new-project
-cd new-project
+git clone https://github.com/rescript-lang/rescript-project-template
+cd rescript-project-template
 npm install
 npm run build
 node src/Demo.bs.js

pages/docs/manual/v8.0.0/installation.mdx

@@ -19,8 +19,8 @@ npm install -g bs-platform
 **Note**: this starts a new project with the new syntax, not the old Reason syntax.
 
 ```sh
-git clone https://github.com/rescript-lang/new-project
-cd new-project
+git clone https://github.com/rescript-lang/rescript-project-template
+cd rescript-project-template
 npm install
 npm run build
 node src/Demo.bs.js