add new webpack vue entrypoint for activity

+ rename existing activity.scss
+ rename webpack vue accompanyingCourse entrypoint

src/Bundle/ChillActivityBundle/Resources/public/scss/chillactivity.scss

@@ -0,0 +1,10 @@
+@import '~ChillMainSass/custom/config/colors';
+@import '~ChillMainSass/custom/mixins/entity';
+
+.chill-entity.chill-entity__activity-reason {
+    @include entity($chill-pink, white);
+}
+
+.activity {
+    color: $chill-green;
+}