Split docs into multiple pages

docs/guide/screen-from-assets.md

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+# Screen image from `assets` folder
+
+## In Vite powered projects
+
+```vue
+<template>
+  <Mockup :screen="screenImage" />
+</template>
+
+<script setup>
+import Mockup from 'vue-three-d-mockup';
+import screenImage from './assets/screen.png';
+</script>
+```
+
+## In Vue CLI powered projects
+
+```vue
+<template>
+  <Mockup :screen="require('./assets/screen.png')" />
+</template>
+
+<script setup>
+import Mockup from 'vue-three-d-mockup';
+</script>
+```