Fix logout, update Playwright snapshots

Also fix `playwright.env` getting all sorts of junk in it.

dev/test-build

@@ -25,7 +25,7 @@ case $yn in
         npx playwright install --with-deps
 
         # Run Playwright tests with a new user
-        printf "CREATE_USER=True\[email protected]\nPLAYWRIGHT_PASSWORD=tester_password" >> ../e2e/playwright.env
+        printf "CREATE_USER=True\[email protected]\nPLAYWRIGHT_PASSWORD=tester_password" > ../e2e/playwright.env
         npx playwright test
 
         read -p "Delete test build folder (./.test_project/)? (Y/N) " yn2

templates/placeholder.html

@@ -21,9 +21,10 @@ <h1>Blaze.horse — Django Starter Kit</h1>
     <p>
       Now you can see <a href="{% url 'private-page' %}">the private page</a>.
     </p>
-    <p>
-      <a href="{% url 'logout' %}">Log out</a>
-    </p>
+    <form method="post" action="{% url 'logout' %}">
+      {% csrf_token %}
+      <button>Log out</button>
+    </form>
   {% else %}
     <p>
       <a href="{% url 'login' %}">Log in</a>

templates/private.html

@@ -8,7 +8,8 @@
   <h1>Private page!</h1>
 
   <p>Logged in as {{ request.user }}</p>
-  <p>
-    <a href="{% url 'logout' %}">Log out</a>
-  </p>
+  <form method="post" action="{% url 'logout' %}">
+    {% csrf_token %}
+    <button>Log out</button>
+  </form>
 {% endblock content %}