Add "How to navigate the docs" to index.md (#171)

docs/src/index.md

@@ -41,7 +41,7 @@ features:
 
 <div class="vp-doc" style="width:80%; margin:auto">
 
-<h1> What is GeometryOps.jl? </h1>
+# What is GeometryOps.jl?
 
 GeometryOps.jl is a package for geometric calculations on (primarily 2D) geometries.
 
@@ -51,6 +51,16 @@ Most of the usecases are driven by GIS and similar Earth data workflows, so this
 
 We welcome contributions, either as pull requests or discussion on issues!
 
+# How to navigate the docs
+
+GeometryOps' [docs](https://juliageo.org/GeometryOps.jl/stable) are divided into three main sections: tutorials, explanations and source code.  
+Documentation and examples for many functions can be found in the source code section, since we use literate programming in GeometryOps.
+
+- Tutorials are meant to teach the fundamental concepts behind GeometryOps, and how to perform certain operations.
+- Explanations usually contain little code, and explain in more detail how GeometryOps works.
+- Source code usually contains explanations and examples at the top of the page, followed by annotated source code from that file.
+
+
 
 </div>