feat: add FAQ question form with email notifications and validations

- Created `FaqQuestionForm` in `forms.py` with custom field validations
- Added FAQ form to the FAQ section with CSRF protection and error handling
- Integrated email notifications to administrator upon FAQ submission
- Updated styles and scripts for form inputs, validation messages, and messages UI
- Adjusted FAQ section layout in `faq.html` and related CSS for responsiveness
- Implemented tests for FAQ form submission and email notifications

templates/users/login.html

@@ -8,7 +8,7 @@
 {% endblock %}
 
 {% block content %}
-    <div class="auth-page">
+    <div class="full-page">
         {% include "_fragments/header.html" %}
 
         <main class="auth-section">

templates/users/register.html

@@ -91,7 +91,7 @@
                             {% endfor %}
                         </div>
 
-                        <div class="auth-actions">
+                        <div class="register-auth-actions">
                             <button class="auth-submit" type="submit">Создать аккаунт</button>
                             <p class="auth-switch">
                                 Уже есть аккаунт?