feat(frontend): integrate tailwind pipeline and update templates

templates/users/signup.html

@@ -3,12 +3,12 @@
 {% block title %}HoopScout | Signup{% endblock %}
 
 {% block content %}
-<section class="panel narrow">
+<section class="panel mx-auto max-w-lg">
   <h1>Create account</h1>
-  <form method="post" class="stack">
+  <form method="post" class="mt-4 space-y-4">
     {% csrf_token %}
     {{ form.as_p }}
-    <button type="submit" class="button">Create account</button>
+    <button type="submit" class="btn">Create account</button>
   </form>
 </section>
 {% endblock %}