Reorder documentation sections (#763)

Author: tsmbland

docs/index.rst

@@ -15,13 +15,13 @@ ModUlar energy system Simulation Environment: MUSE
 
    Glossary <glossary>
    Getting Help <getting-help>
-   installation/index
-   Running MUSE <running-muse-example>
    MUSE Overview <overview>
-   Application Flow <application-flow>
    Key MUSE Components <muse-components>
-   user-guide/index
+   Application Flow <application-flow>
+   installation/index
+   Running MUSE <running-muse-example>
    inputs/index
+   user-guide/index
    advanced-guide/index
    faq
    api