Merge pull request #925 from dannon/metabolomics-category-description

Add metabolomics category description with mass spectrometry workflows

Author: mvdbeek

website/public/category-descriptions/metabolomics.md

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+Mass spectrometry-based workflows for comprehensive small molecule analysis and metabolite profiling.
+These include preprocessing pipelines for LC-MS and GC-MS data using XCMS, molecular formula assignment
+with MFAssignR, metabolite identification and annotation, and untargeted metabolomics analysis protocols
+for biomarker discovery and pathway analysis.