Error templates

src/templates/400.html

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+{% extends 'base.html' %}
+
+{% block content %}
+<article class="error-view">
+    <h1>400 Bad request</h1>
+</article>
+{% endblock %}

src/templates/403.html

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+{% extends 'base.html' %}
+
+{% block content %}
+<article class="error-view">
+    <h1>403 Forbidden</h1>
+</article>
+{% endblock %}

src/templates/404.html

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+{% extends 'base.html' %}
+
+{% block content %}
+<article class="error-view">
+    <h1>404 Page not found</h1>
+</article>
+{% endblock %}

src/templates/500.html

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+{% extends 'base.html' %}
+
+{% block content %}
+<article class="error-view">
+    <h1>500 Server error</h1>
+</article>
+{% endblock %}