Add narrative

Author: s-t-h

narrative.md

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+# [slide title](https://raw.githubusercontent.com/Integrative-Transcriptomics/Nextstrain-TrepoGen/4bc4df6592d553758843eb217d7df49abc032ad2/ds/TPASS-2588-snv-Tp0326.json)
+
+Slide content rendered in the left-hand sidebar (as normal)
+
+```auspiceMainDisplayMarkdown
+
+Markdown content rendered in the right-hand pane of the display, where the dataset would normally be.
+
+_Note that the dataset URL is still required, although unused._
+
+```