docs(project): execute grails doc --init

Closes #10

src/docs/guide/introduction.gdoc

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+This is an example documentation template. The syntax format is similar to "Textile":http://textile.thresholdstate.com/.
+
+You can apply formatting such as *bold*, _italic_ and @code@. Bullets are possible too:
+
+* Bullet 1
+* Bullet 2
+
+As well as numbered lists:
+
+# Number 1
+# Number 2
+
+The documentation also handles links to [guide items|guide:introduction] as well as [reference|items]

src/docs/guide/toc.yml

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+introduction: Introduction

src/docs/ref/Items/reference.gdoc

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+h1. example
+
+h2. Purpose
+
+This is an example reference item.
+
+h2. Examples
+
+You can use code snippets:
+
+{code}
+def example = new Example()
+{code}
+
+h2. Description
+
+And provide a detailed description