feat(docs): change order of sections in nav (#1471)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: vikunja/api#1471
Reviewed-by: konrad <k@knt.li>
Co-authored-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>
Co-committed-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>

docs/config.yml

@@ -54,3 +54,10 @@ menu:
     - name: Get it Hosted
       url: https://vikunja.cloud/?utm_source=io&utm_medium=io&utm_campaign=menu
       weight: 70
+  sidebar:
+    - name: setup
+      weight: 10
+    - name: usage
+      weight: 20
+    - name: development
+      weight: 30