Revamp all form submissions with Flask-WTF forms

- Rename blueprint route 'main.user' to 'main.view_user' for clarity
- Rename 'forms.py' to 'route_forms.py'

templates/layouts/header.html

@@ -7,7 +7,7 @@
         <div class="header-login">
             {% if current_user.is_authenticated %}
                 Logged in as
-                <a href="{{ url_for('main.user', username=current_user.username) }}" class="username">{{ current_user.username }}</a>
+                <a href="{{ url_for('main.view_user', username=current_user.username) }}" class="username">{{ current_user.username }}</a>
                 <a href="{{ url_for('main.edit_user', username=current_user.username) }}"><i class="fas fa-cog fa-1x"></i></a>
                 | <a href="{{ url_for('auth.logout') }}">Logout</a>
             {% else %}

templates/layouts/index.html

@@ -7,7 +7,7 @@
             <div>
                 <ul>
                     {% for new_user in new_users %}
-                        <li><a href="{{ url_for('main.user', username=new_user.username) }}">{{ new_user.username }}</a> as
+                        <li><a href="{{ url_for('main.view_user', username=new_user.username) }}">{{ new_user.username }}</a> as
                             of {{ new_user.get_registration_delta() }} ago
                         </li>
                     {% endfor %}