DOC-026: Move overview to the index page, above the comments.

Author: mvousden

docs/index.rst

@@ -1,8 +1,34 @@
-Welcome to the Virtual Micromagnetics documentation
-===================================================
+Virtual Micromagnetics Documentation
+====================================
+
+Welcome to the :term:`Virtual Micromagnetics` project, where we aim to enable
+accessible and reproducible micromagnetics simulation, without compromise.
+
+The :term:`Virtual Micromagnetics` project creates :term:`virtual
+environment`\s that run micromagnetic (and in some cases, atomistic)
+simulations of magnetic behaviour. These environments produce :term:`system
+virtual machine`\s which emulate a configured set of software on your
+computer. This means you as a user only need to manage the software to support
+the virtual machine, as opposed to the complicated set of dependencies most
+simulation packages require. As a result, these virtual environments are far
+simpler to maintain, meaning you have more time to solve the mysteries of the
+universe instead of:
+
+ - wondering why the latest version of a package is incompatible with earlier
+   simulations.
+
+ - wondering how to maintain multiple versions of a package to support old
+   simulation software.
+
+ - persuading your high-performance computing system administrator to support
+   your long list of software dependencies.
+
+ - setting up user accounts and packages for new students to run simulations.
+
+Contents
+--------
 
 .. toctree::
-   introduction
    getting-started
    virtual-machine-software
    user-information