Basicamente criei um arquivo base.html no templates/usuarios contendo o conteudo repetido de login.html e cadastro.html
Arquivo base.html:
{% load static %}
<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Alura Space</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap" rel="stylesheet">
<!-- CSS only -->
<link rel="stylesheet" href="{% static '/styles/style.css' %}">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Zenh87qX5JnK2Jl0vWa8Ck2rdkQ2Bzep5IDxbcnCeuOxjzrPF/et3URy9Bv1WTRi" crossorigin="anonymous">
</head>
<body>
{% include 'partials/_menu.html' %}
{% block content %} {% endblock %}
{% include 'partials/_footer.html' %}
</body>
</html>
Arquivo de login.html:
{% extends 'usuarios/base.html' %}
{% load static %}
{% block content %}
<section class="galeria" style="margin-left: 5em">
<form action="{% url 'login' %}" method="post">
{% csrf_token %}
<div class="row">
{% for field in form.visible_fields %}
<div class="col-12 col-lg-12" style="margin-bottom: 10px;">
<label for="{{ field.id_for_label }}" style="color:#D9D9D9; margin-bottom: 5px;">{{field.label}}</label>
{{field}}
</div>
{% endfor %}
</div>
<div class="col-12 text-center">
<button type="submit" class="btn btn-success col-12" style="padding: top 5px;">Logar</button>
</div>
</div>
</form>
</section>
</main>
</div>
{% endblock %}
Arquivo de cadastro.html:
{% load static %}
{% block content %}
<section class="galeria" style="margin-left: 5em">
<form action="{% url 'cadastro' %}" method="post">
{% csrf_token %}
<div class="row">
{% for field in form.visible_fields %}
<div class="col-12 col-lg-12" style="margin-bottom: 10px;">
<label for="{{ field.id_for_label }}" style="color:#D9D9D9; margin-bottom: 5px;">{{field.label}}</label>
{{field}}
</div class="alert alert-danger">
{% for error in field.errors %}
<div>
{{error}}
</div>
{% endfor %}
{% endfor %}
</div>
<div class="col-12 text-center">
<button type="submit" class="btn btn-success col-12" style="padding: top 5px;">Cadastrar</button>
</div>
</div>
</form>
</section>
</main>
</div>
{% endblock %}
