feat: add total results display at search page

closes #86

src/.vuepress/components/SearchInput.vue

 <template>
   <form @submit="onSubmit">
-      <v-row class="mb-5">
+      <v-row class="mb-2">
         <v-col
           cols="6"
           class="d-flex align-top input-container"

src/.vuepress/components/SearchPage.vue

 <template>
   <div>
     <SearchInput @search="onSearchInput" />
+    <p
+      v-if="total > 0"
+      class="text-overline mb-0"
+    >{{total}} Results</p>
     <SearchResultList :items="items" />
     <div class="text-center">
       <v-pagination

src/.vuepress/components/SearchResultList.vue

@@ -5,7 +5,7 @@
       subheader
       v-if="items.length > 0"
     >
-      <v-list-item v-for="item in items" :key="item.item">
+      <v-list-item v-for="item in items" :key="item.item" class="pl-0">
         <v-list-item-content>
           <a :href="getItemUrl(item)" target="_blank">
             <v-list-item-title>{{item.label}}</v-list-item-title>