embed html template and static files

admin/templates/html/login.html

@@ -0,0 +1,50 @@
+{{define "head"}}
+<title>Login - ari melody 💫</title>
+<link rel="shortcut icon" href="/img/favicon.png" type="image/x-icon">
+<link rel="stylesheet" href="/admin/static/admin.css">
+<style>
+form#login {
+    width: 100%;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+}
+
+form div {
+    width: 20rem;
+}
+
+form button {
+    margin-top: 1rem;
+}
+
+input {
+    width: calc(100% - 1rem - 2px);
+}
+</style>
+{{end}}
+
+{{define "content"}}
+<main>
+    {{if .Session.Message.Valid}}
+    <p id="message">{{html .Session.Message.String}}</p>
+    {{end}}
+    {{if .Session.Error.Valid}}
+    <p id="error">{{html .Session.Error.String}}</p>
+    {{end}}
+
+    <form action="/admin/login" method="POST" id="login">
+        <h1>Log In</h1>
+
+        <div>
+            <label for="username">Username</label>
+            <input type="text" name="username" value="" autocomplete="username" required autofocus>
+
+            <label for="password">Password</label>
+            <input type="password" name="password" value="" autocomplete="current-password" required>
+        </div>
+
+        <button type="submit" class="save">Login</button>
+    </form>
+</main>
+{{end}}