Chore: Remove dead code related to billing (#935)

- remove subscription model
- remove billing-related code

app/javascript/dashboard/components/widgets/StatusBar.vue

@@ -1,24 +0,0 @@
-<template>
-  <div class="status-bar" :class="type">
-    <p class="message">{{message}}</p>
-    <router-link
-      :to="buttonRoute"
-      class="button small warning nice"
-      v-if="showButton"
-    >
-      {{buttonText}}
-    </router-link>
-  </div>
-</template>
-
-<script>
-export default {
-  props: {
-    message: String,
-    buttonRoute: Object,
-    buttonText: String,
-    showButton: Boolean,
-    type: String, // Danger, Info, Success, Warning
-  },
-};
-</script>