Update index.rst

docs/index.rst

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 Metabolomics Workflow
 ==============================
 
-Summary
+.. image:: metamsworkflow.png
+
+Workflow Overview
 -------
 
 The gas chromatography-mass spectrometry (GC-MS) based metabolomics workflow (metaMS) has been developed by leveraging PNNL's CoreMS software framework.
 The current software design allows for the orchestration of the metabolite characterization pipeline, i.e., signal noise reduction, m/z based Chromatogram Peak Deconvolution,
 abundance threshold calculation, peak picking, spectral similarity calculation and molecular search, similarity score calculation, and confidence filtering, all in a single step.
 
-
-Workflow Diagram
-------------------
-
-.. image:: metamsworkflow.png
-
-
 Workflow Dependencies
 ---------------------