added upload and better gradient view

isotables/isotopapp/templates/home.html

@@ -2,6 +2,23 @@
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"
           integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
 </head>
+<nav class="navbar navbar-expand-lg navbar-light bg-light">
+  <div class="collapse navbar-collapse" id="navbarSupportedContent">
+    <ul class="navbar-nav mr-auto">
+      <li class="nav-item">
+	<a class="nav-link" href="{% url 'home' %}">Isotopes</a>
+      </li>
+      <li class="nav-item">
+	<a class="nav-link" href="{% url 'sfg' %}">Position</a>
+      </li>
+
+      <li class="nav-item">
+	{% load admin_urls %}
+	<a class="nav-link" href="{% url 'admin:index' %}">Admin</a>
+      </li>
+    </ul>
+  </div>
+</nav>
 <style>
     .center {
         margin: auto;
@@ -66,4 +83,3 @@
 <div>
     {{ ans }}
 </div>
-