Simplify Europa Docs sidebar

- move Dagger 0.1 references to the top
- move Dagger CUE API under Core Concepts, after What is CUE?
- move Go on Docker Swarm under Use Cases

A few minor title changes:
- Dagger CUE API (0.2+) -> Dagger CUE API
- What is Cue? -> What is CUE?

Signed-off-by: Gerhard Lazu <gerhard@lazu.co.uk>

website/sidebars.js

@@ -71,6 +71,15 @@ module.exports = {
     },
   ],
   europa: [
+    {
+      type: "link",
+      label: "⬅️ Dagger 0.1",
+      href: "/1200/what/",
+    },
+    {
+      type: "doc",
+      id: "migrate-from-dagger-0.1",
+    },
     {
       type: "category",
       label: "Getting Started",
@@ -92,29 +101,15 @@ module.exports = {
         "core-concepts/dagger-cue",
       ],
     },
-    {
-      type: "category",
-      label: "Knowledge Base",
-      collapsible: false,
-      collapsed: false,
-      items: [
-        "knowledge-base/migrate-from-dagger-0.1",
-        "use-cases/go-docker-swarm",
-      ],
-    },
     {
       type: "category",
       label: "Use Cases",
       collapsible: false,
       collapsed: false,
       items: [
+        "use-cases/go-docker-swarm",
         "use-cases/go-on-docker-hub"
       ],
     },
-    {
-      type: "link",
-      label: "⬅️ Dagger 0.1",
-      href: "/1200/what/",
-    },
   ],
 };