Add new settings content component

This commit adds a new settings conent component. This is a container
component for the settings pages, so that they all get the same
formatting by default. It handles the header text, description text, and
any "add new" plus button as needed.

client/components/app/SettingsContent.vue

@@ -0,0 +1,48 @@
+<template>
+  <div class="bg-bg rounded-md shadow-lg border border-white border-opacity-5 p-4 mb-8">
+    <div class="flex items-center mb-2">
+      <h1 class="text-xl">{{ headerText }}</h1>
+
+      <div v-if="showAddButton" class="mx-2 w-7 h-7 flex items-center justify-center rounded-full cursor-pointer hover:bg-white hover:bg-opacity-10 text-center" @click="clicked">
+        <span class="material-icons" style="font-size: 1.4rem">add</span>
+      </div>
+    </div>
+
+    <p v-if="description" id="description" class="mb-6 text-gray-200" v-html="description" />
+
+    <slot></slot>
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    headerText: String,
+    description: String,
+    note: String,
+    showAddButton: Boolean
+  },
+  methods: {
+    clicked() {
+      this.$emit('clicked');
+    }
+  }
+}
+</script>
+
+<style>
+#description a {
+  color: rgb(96 165 250);
+}
+#description a:hover {
+  color: rgb(147 197 253);
+  text-decoration-line: underline;
+}
+#description code {
+  font-size: 0.875rem;
+  border-radius: 6px;
+  background-color: rgb(82, 82, 82);
+  color: white;
+  padding: 2px 4px;
+}
+</style>