Update file tree to reflect actual folder created

The file tree visualization gave the impression that Sources, Public, Resources and Package.swift would all be created in the current folder after running `vapor new Hello`, which isn't the case.

getting-started/hello-world.md

@@ -19,7 +19,7 @@ vapor new Hello
 Vapor's folder structure will probably look familiar to you if you have worked with other web frameworks.
 
 ```
-.
+Hello
 ├── Sources
 │   └── App
 │       └── Controllers
@@ -35,7 +35,7 @@ Vapor's folder structure will probably look familiar to you if you have worked w
 For our Hello, World project, we will be focusing on the `main.swift` file.
 
 ```
-.
+Hello
 └── Sources
     └── App
         └── main.swift