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/src/components/tile.jsx

@@ -8,7 +8,7 @@ export function Tile({ title, imageSource, imageSourceLight, link, external }) {
       className={styles.tile}
       target={external ? "_blank" : "_self"}
     >
-      <h4>{title}</h4>
+      <h3>{title}</h3>
       <img
         className={imageSourceLight ? "hideonlight" : ""}
         src={imageSource}