docs(providers): restructured openfeature provider docs into language-specific pages (#953)

Author: sauraww

docs/docs/clients/_category_.json

@@ -0,0 +1,10 @@
+{
+  "label": "Superposition Providers",
+  "position": 5,
+  "collapsible": true,
+  "collapsed": false,
+  "link": {
+    "type": "generated-index",
+    "description": "OpenFeature Provider documentation for Superposition across all supported languages."
+  }
+}

docs/docs/clients/openfeature/README.md

@@ -0,0 +1,10 @@
+{
+  "label": "OpenFeature Providers",
+  "position": 1,
+  "collapsible": true,
+  "collapsed": false,
+  "link": {
+    "type": "doc",
+    "id": "providers/openfeature/overview"
+  }
+}