add sign up process for backlogger

backlogger/templates/backlogger/login.html

@@ -89,7 +89,13 @@
     <p class="subtitle">Backlogger</p>
 
     {% if form.non_field_errors %}
-    <div class="error-banner">Invalid username or password.</div>
+      {% for error in form.non_field_errors %}
+        {% if 'inactive' in error|lower or 'active' in error|lower %}
+        <div class="error-banner">Your account is pending approval. You'll be able to log in once it's activated.</div>
+        {% else %}
+        <div class="error-banner">Invalid username or password.</div>
+        {% endif %}
+      {% endfor %}
     {% endif %}
 
     <form method="post">
@@ -109,6 +115,9 @@
 
       <button type="submit" class="btn">Log in</button>
     </form>
+    <p style="text-align:center; margin-top:1.25rem; font-size:0.83rem; color:#64748b;">
+      No account? <a href="/accounts/signup/" style="color:#38bdf8; text-decoration:none;">Sign up</a>
+    </p>
   </div>
 </body>
 </html>