docs(IX-3615): update README link and adjust ThemeSwitcher height (#132)

Author: alexkaduk

README.md

@@ -15,7 +15,7 @@
     <a href="https://ix.siemens.io"><strong>Explore the documentation »</strong></a>
     <br />
     <br />
-    <a href="https://ix.siemens.io/docs/installation/">Quickstart</a>
+    <a href="https://github.com/siemens/ix-docs/blob/main/CONTRIBUTING.md">Contributing</a>
     ·
     <a href="https://community.siemens.com/c/ix/">Community</a>
     ·

docs/home/theming/usage-developers.md

@@ -104,4 +104,4 @@ import '@siemens/ix/dist/siemens-ix/theme/classic-dark.css';
 
 ## Working with themes during runtime
 
-<ThemeSwitcher />
+<ThemeSwitcher height="15rem" />

src/components/Playground/index.tsx

@@ -90,7 +90,7 @@ function Playground(props: PlaygroundProps) {
   const iframeSrc = useBaseUrl(
     `/demo/v2/preview/html/preview-examples/${
       props.alternativePreviewName ?? props.name
-    }.html?no-margin=true&theme=theme-${theme}-${isDark ? 'dark' : 'light'}`
+    }.html?no-margin=true&theme=${theme}&colorSchema=${isDark ? 'dark' : 'light'}`
   );
   const [framework, setFramework] = useState<FrameworkTypes>(
     props.onlyFramework ?? 'angular'