fix page reload when enter pressed in docs searchbar

docs/index.html

@@ -78,10 +78,11 @@
           <article class="markdown-body">
             <div class="searchCondition">
               <div>
-                <form style="display:flex;">
+                <form style="display:flex;" v-on:submit.prevent="onSubmit">
                   <label for="search" style="margin-right: 3px;" >search:</label>
                   <div style="position: relative;">
                     <input id="search" placeholder="Search all options" v-model="searchCondition">
+                    <input type="hidden">
                     <svg style="position: absolute; left: 8px; top: 7px;" class="octicon octicon-search subnav-search-icon" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true">
                       <path fill-rule="evenodd" d="M15.7 13.3l-3.81-3.83A5.93 5.93 0 0 0 13 6c0-3.31-2.69-6-6-6S1 2.69 1 6s2.69 6 6 6c1.3 0 2.48-.41 3.47-1.11l3.83 3.81c.19.2.45.3.7.3.25 0 .52-.09.7-.3a.996.996 0 0 0 0-1.41v.01zM7 10.7c-2.59 0-4.7-2.11-4.7-4.7 0-2.59 2.11-4.7 4.7-4.7 2.59 0 4.7 2.11 4.7 4.7 0 2.59-2.11 4.7-4.7 4.7z"></path>
                     </svg>