add demos for Tailwind theme (Panels, Media, Misc)

doc/image/theming/UnstyledDoc.vue

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+<template>
+    <DocSectionText v-bind="$attrs">
+        <p>Theming is implemented with the pass through properties in unstyled mode. Example below demonstrates the built-in Tailwind theme.</p>
+    </DocSectionText>
+    <DocSectionCode :code="code" embedded />
+</template>
+
+<script>
+export default {
+    data() {
+        return {
+            code: {
+                composition: `
+<template>
+    <div class="card flex justify-content-center">
+        <Image src="https://primefaces.org/cdn/primevue/images/galleria/galleria10.jpg" alt="Image" width="250" preview />
+    </div>
+</template>`
+            }
+        };
+    }
+};
+</script>