[ci skip] better intro

Author: pmocz

docs/source/index.rst

@@ -2,10 +2,15 @@
 Modules for Experiments in Stellar Astrophysics
 ###############################################
 
-Modules for Experiments in Stellar Astrophysics (MESA) is an open-source 1D stellar evolution code.
+Modules for Experiments in Stellar Astrophysics (MESA) is an advanced, open-source 1D stellar evolution code.
 The code is developed by a globally distributed team of researchers studying a range of stellar astrophysical phenomena.
-MESA is written primarily in Fortran in a modular and interfaceable way.
-Get started with the :ref:`quickstart guide<quickstart:Quickstart>` 🚀 or check out the full documentation below.
+MESA is written primarily in Fortran with a modular, flexible design that facilitates easy interfacing.
+
+🚀 New to MESA? Start with the :ref:`quickstart guide<quickstart:Quickstart>` to set up and run your first models.
+
+📖 Experienced users may find the :ref:`Reference and Defaults<reference:Reference and Defaults>` page most valuable for exploring the code’s features and input parameters.
+
+Or, you can check out the full documentation below.
 
 .. toctree::
    :maxdepth: 1