[Style] Rename cfp_introduction.scss to intro.scss; Separate from main

src/components/CFP/IntrodContainer.vue

@@ -137,3 +137,7 @@ import { Component, Prop, Vue } from 'vue-property-decorator';
 @Component
 export default class IntrodContainer extends Vue {}
 </script>
+
+<style lang="scss">
+@import '@/assets/scss/CFP/intro';
+</style>