Update example file structure, give each shortcode own file

exampleSite/content/docs/shortcodes/mermaid.md

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+# Mermaid Chart
+
+[Mermaid](https://mermaidjs.github.io/) is library for generating svg charts and diagrams from text.
+
+## Example
+
+{{< columns >}}
+```tpl
+{{</* mermaid [class="text-center"]*/>}}
+sequenceDiagram
+    Alice->>Bob: Hello Bob, how are you?
+    alt is sick
+        Bob->>Alice: Not so good :(
+    else is well
+        Bob->>Alice: Feeling fresh like a daisy
+    end
+    opt Extra response
+        Bob->>Alice: Thanks for asking
+    end
+{{</* /mermaid */>}}
+```
+
+<--->
+
+{{< mermaid >}}
+sequenceDiagram
+    Alice->>Bob: Hello Bob, how are you?
+    alt is sick
+        Bob->>Alice: Not so good :(
+    else is well
+        Bob->>Alice: Feeling fresh like a daisy
+    end
+    opt Extra response
+        Bob->>Alice: Thanks for asking
+    end
+{{< /mermaid >}}
+
+{{< /columns >}}