Fix logout logic to use POST (Django 4.1+)

[07SUJITH]

Issue: Logout via GET is no longer allowed from Django 4.1 onwards.
🔗 Ref: Django 4.1 Release Notes – logout via GET

Fix: Updated logout links in all language versions of the tutorial to use a POST form.

Before

<a href="{% url 'logout' %}">Log out</a>

After

<form method="POST" action="{% url 'logout' %}" style="display:inline;">
  {% csrf_token %}
  <button type="submit" style="padding:0; border:none; background:none; color:#337ab7; text-decoration:underline; cursor:pointer;">
    Log out
  </button>
</form>

Updated Files

• en/authentication_authorization/README.md
• es/authentication_authorization/README.md
• fa/authentication_authorization/README.md
• ja/authentication_authorization/README.md
• co/authentication_authorization/README.md

Ensures compatibility with Django 4.1+ and maintains secure logout practice.

---

Fixes: #183

[07SUJITH]

Hi @das-g,

Could you please review the PR addressing the logout via POST issue for Django 4.1+ (Fixes #183)? This update aligns with the main tutorial's Django~=5.1.2 version, ensuring compatibility by disabling logout via GET.