Improve docs, add internals guide

docs/getting-started/creating-a-place.md

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+[TOC]
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+## Creating the Rojo Project
+
 To use Rojo to build a place, you'll need to create a new project file, which tells Rojo how your project is structured on-disk and in Roblox.
 
 Create a new folder, then run `rojo init` inside that folder to initialize an empty project.