add switcher

Author: SimonBlanke

docs/source/_static/switcher.json

@@ -0,0 +1,25 @@
+[
+    {
+        "name": "dev (latest)",
+        "version": "dev",
+        "url": "https://gradient-free-optimizers.readthedocs.io/en/latest/"
+    },
+    {
+        "name": "1.11.0 (stable)",
+        "version": "1.11.0",
+        "url": "https://gradient-free-optimizers.readthedocs.io/en/stable/",
+        "preferred": true
+    },
+    {
+        "version": "1.9.0",
+        "url": "https://gradient-free-optimizers.readthedocs.io/en/v1.9.0/"
+    },
+    {
+        "version": "1.8.1",
+        "url": "https://gradient-free-optimizers.readthedocs.io/en/v1.8.1/"
+    },
+    {
+        "version": "1.8.0",
+        "url": "https://gradient-free-optimizers.readthedocs.io/en/v1.8.0/"
+    }
+]