Update docs index description to cover programmer and non-programmer …

…audiences with proper documentation sections

docs/index.rst

@@ -3,7 +3,9 @@ Welcome to chordparser's documentation!
 
 chordparser is a Python 3 package that provides a musical framework for analysing chords. The :doc:`Introduction <introduction>` covers what it is and why it is.
 
-Get started with :doc:`Installation <installation>` and then jump right into using chordparser with the :doc:`Quick Start <quickstart>`. The rest of the docs describe the Parser and each musical class that chordparser provides in detail so you can use the framework effectively.
+If you are a musician, not a programmer, and you just want to see chordparser in action, the `Colab notebook <https://colab.research.google.com/drive/1T5WcH2WMHqpqbJrzxDt_Mg03lw1aXho7?usp=sharing>`_ is for you. It showcases the functions of chordparser and you can even use it for your own chord sheets without knowing any programming!
+
+If you are a programmer however, then get started with :doc:`Installation <installation>` and jump right into using chordparser with the :doc:`hands-on Tutorial <tutorial>`. The :doc:`How-to guides <howto/main>` provide step-by-step guides on using different aspects of chordparser, while the :doc:`Reference <reference/main>` gives a full technical reference to all of chordparser's classes. Finally, the :doc:`Background section <background/main>` provides explanation and discussion of key topics.
 
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 Contents
@@ -15,10 +17,10 @@ Contents
 
    introduction
    installation
-   quickstart
-   parser
-   music/main
-   helpers/main
+   tutorial
+   howto/main
+   reference/main
+   background/main
    authors
    contributing
    licence