docs: optimized examples and sdk for search (#8657)

# Which Problems Are Solved

Page title was "introduction" and the headings were missing a h2 level.
This makes it difficult to index for search, both internal and external.

# How the Problems Are Solved

* Change the page title
* Pulled all headings one level up

# Additional Changes

- Show all elements in sdk-example folder automaticalls

docs/sidebars.js

@@ -54,18 +54,10 @@ module.exports = {
       label: "Examples & SDKs",
       link: {type: "doc", id: "sdk-examples/introduction"},
       items: [
-        "sdk-examples/introduction",
-        "sdk-examples/angular",
-        "sdk-examples/flutter",
-        "sdk-examples/go",
-        "sdk-examples/java",
-        "sdk-examples/nestjs",
-        "sdk-examples/nextjs",
-        "sdk-examples/python-flask",
-        "sdk-examples/python-django",
-        "sdk-examples/react",
-        "sdk-examples/symfony",
-        "sdk-examples/vue",
+        {
+          type: "autogenerated", 
+          dirName: "sdk-examples"
+        },
         {
           type: "link",
           label: "Dart",