documentation: add a direct link to our HOWTO guide.

Author: dbrnz

README.md

@@ -34,3 +34,7 @@ $ pnpm start
 Maps can then be viewed at http://localhost:3000.
 
 ---
+
+## Example usage
+
+See [here](https://anatomicmaps.github.io/flatmap-viewer/documents/HowTo_Guide.html)

typedoc.json

@@ -3,6 +3,7 @@
     "readme": "./README.md",
     "projectDocuments": ["documentation/howto.md"],
     "navigationLinks": {
+        "Examples": "https://anatomicmaps.github.io/flatmap-viewer/documents/HowTo_Guide.html",
         "API": "https://anatomicmaps.github.io/flatmap-viewer/modules/index.html",
         "GitHub": "https://github.com/AnatomicMaps/flatmap-viewer"
     },