feat: add version 3.1.0 documentation and assets

- Updated versions.json to include 3.1.0
- Added new images and documentation for version 3.1.0
- Created category files for user guide and installation sections

docs/versioned_sidebars/version-3.1.0-sidebars.json

@@ -0,0 +1,8 @@
+{
+  "tutorialSidebar": [
+    {
+      "type": "autogenerated",
+      "dirName": "."
+    }
+  ]
+}