Add html, handler and db mock

html/static/navbar.html

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+{{define "navbar"}}
+<div class="ui inverted menu">
+    <a href="/"><div class="header item">Trikotwaschliste</div></a>
+
+    <div class="right menu">
+        <a href="/querypage/create"><div class="item">Query</div></a>
+        <a href="/stats/interpret"><div class="item">Stats</div></a>
+        <a href="/credits"><div class="item">Credits</div></a>
+    </div>
+</div>
+{{end}}

html/static/style.css

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+.title {
+    text-align: center;
+}
+
+.button {
+    background-color: #4CAF50; /* Green */
+    border: none;
+    color: white;
+    padding: 15px 32px;
+    text-align: center;
+    text-decoration: none;
+    display: inline-block;
+    font-size: 16px;
+}
+
+.button-green {background-color: #4CAF50;} /* Green */
+.button-blue {background-color: #008CBA;} /* Blue */
+.button-red {background-color: #f44336;} /* Red */
+.button-gray {background-color: #e7e7e7; color: black;} /* Gray */
+.button-black {background-color: #555555;} /* Black */
+
+.center {
+    margin: auto;
+    width: 50%;
+    //border: 3px solid green;
+    padding: 10px;
+}
+
+tr:hover {background-color: #f5f5f5;}
+th, td {
+    padding: 15px;
+    text-align: left;
+}
+table {
+    border-collapse: collapse;
+}
+
+table, th, td {
+    border: 1px solid black;
+}