emancipated hardcoded form views & html from base.html, apps.dashboard.views, apps.dashboard.tests.test_views; added get_item_input_box() helper method to functional_tests.base & retrofitted the other FTs to utilize it

src/templates/core/base.html

@@ -18,19 +18,10 @@
                     <h2 class="display-2 mb-2">{% block header_text %}{% endblock header_text %}</h2>
 
                     <form method="POST" action="{% block form_action %}{% endblock form_action %}">
-                        {% if form %}
-                            {{ form.text }}
-                        {% else %}
-                            <input
-                                class="form-control form-control-lg{% if error %} is-invalid{% endif %}"
-                                name="text"
-                                id="id-new-item"
-                                placeholder="Enter a to-do item"
-                            />
-                        {% endif %}
+                        {{ form.text }}
                         {% csrf_token %}
-                        {% if error %}
-                            <div class="invalid-feedback">{{ error }}</div>
+                        {% if form.errors %}
+                            <div class="invalid-feedback">{{ form.errors.text }}</div>
                         {% endif %}
                     </form>
                 </div>