Fix mermaid chart

Author: JMGilbert

README.md

@@ -54,7 +54,6 @@ serve as the main classes to call different menu options.
 
 ```mermaid
 graph TD
-
 SubGraph1Flow(Storage and I/O)
   subgraph "Storage utilities"
   SubGraph1Flow --> A[Stacked_damages]
@@ -67,7 +66,7 @@ SubGraph1Flow(Storage and I/O)
   B[MainMenu] --> C[AddingUpRecipe];
   B[MainMenu] --> D[RiskAversionRecipe];
   B[MainMenu] --> E[EquityRecipe]
-end
+  end
 ```
 
 `StackedDamages` takes care of parsing all monetized damage data from several

mkdocs.yml

@@ -22,6 +22,11 @@ plugins:
 
 markdown_extensions:
   - "pymdownx.snippets"
+  - pymdownx.superfences:
+      custom_fences:
+        - name: mermaid
+          class: mermaid
+          format: !!python/name:pymdownx.superfences.fence_code_format
 
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