Update extrusion example (#7)

Author: Drabble

_data/menu.yaml

@@ -19,6 +19,8 @@ items:
         url: /examples/import-contour-into-postgis/
       - page: Serve vector tiles from PostGIS
         url: /examples/serve-vector-tiles/
+      - page: Extrusion of vector tiles from OSM data
+        url: /examples/extrusion/
       - page: Create an IP to location web service
         url: /examples/ip-to-location/
       - page: Create a geocoding web service

examples/_extrusion/index.md examples/extrusion/index.mdexamples/_extrusion/index.md renamed to examples/extrusion/index.md

@@ -1,17 +1,18 @@
 ---
-layout: default 
-title: Extrusion Example
+layout: default
+title: Extrusion of vector tiles from OSM data
+permalink: /examples/extrusion/
 ---
 
-# Extrusion Example
+# Extrusion of vector tiles from OSM data
 
 This example builds upon the [OpenStreetMap example](https://www.baremaps.com/examples/openstreetmap/) and shows how 3d
 buildings can be extruded with Maplibre. First, start by downloading the OSM data for London in the current directory.
 
 To import London data in the database.
 
 ```
-baremaps workflow execute --file workflow.json
+baremaps workflow execute --file examples/extrusion/workflow.json
 ```
 
 In the [tileset.json](https://raw.githubusercontent.com/apache/incubator-baremaps/main/examples/extrusion/tileset.json)
@@ -72,3 +73,7 @@ Well done, a map of London with extruded buildings should now appear in your [br
 
 ![Tile viewer](screenshot.png)
 
+
+## Conclusion
+
+In this tutorial, we learnt how to import OSM data in PostGIS with a workflow and then use the MVT specification to extrude the vector tiles into a 3d object.

examples/_extrusion/screenshot.png examples/extrusion/screenshot.pngexamples/_extrusion/screenshot.png renamed to examples/extrusion/screenshot.png

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Import Natural Earth data into PostGIS
-permalink: /examples//import-naturalearth-into-postgis/
+permalink: /examples/import-naturalearth-into-postgis/
 ---
 
 # Import Natural Earth data into PostGIS

examples/import-naturalearth-into-postgis/index.md

@@ -20,6 +20,7 @@ For the creation of custom vector tiles you can follow these guides:
 - The [OpenStreetMap](/examples/import-osm-into-postgis/) example is a good introduction to Baremaps, it shows how to produce high resolution vector tiles.
 - The [NaturalEarth](/examples/import-naturalearth-into-postgis/) example shows how to produce low resolution vector tiles.
 - The [Contour](/examples/import-contour-into-postgis/) example shows how to produce contour lines from a digital elevation model.
+- The [Extrusion](/examples/extrusion/) example shows how to import OSM data into postgis and use the MVT specification to extrude the vectors into 3d.
 
 For the creation of an IP to location service follow this guide: