feat: Implement a webpage for self-service password resets

src/web/pages/templates/_components/avatar.html.j2

@@ -0,0 +1,6 @@
+{% match avatar_type %}
+    {% when AvatarType::Initial with (initial) %}
+    <span class="avatar" role="img">{{ initial }}</span>
+    {% when AvatarType::Image with (src) %}
+    <img class="avatar" src="{{ src }}">
+{% endmatch %}

src/web/pages/templates/_components/form.html.j2

@@ -0,0 +1,29 @@
+<form method="post">
+    {% let validation_errors = validation_errors.clone().unwrap_or_default() %}
+    {% let field_errors = validation_errors.field_errors() %}
+    {% for input in inputs %}
+        <p>
+            <label for="{{ input.id }}">{{ input.label }}</label>
+            {% let name = std::borrow::Cow::from(*input.id) %}
+            {% if let Some(errors) = field_errors.get(name) %}
+                {% for error in errors %}
+                    <small class="error">
+                        {% if let Some(message) = error.message %}
+                            {{ message }}
+                        {% else %}
+                            Mysterious validation error <code>{{ error.code }}</code>!
+                        {% endif %}
+                    </small>
+                {% endfor %}
+            {% endif %}
+            <input
+                type="{{ input.input_type }}"
+                id="{{ input.id }}"
+                {% if input.type_name.is_some() %}name="{{ input.id }}"{% endif %}
+                {% if input.required %}required{% endif %}
+            >
+        </p>
+    {% endfor %}
+
+    <button type="submit">{{ submit_label }}</button>
+</form>

src/web/pages/templates/_components/user_card.html.j2

@@ -0,0 +1,9 @@
+<div class="user-card">
+    {{ avatar() }}
+    <div class="info">
+        {% if let Some(display_name) = display_name %}
+        <p class="display-name">{{ display_name }}</p>
+        {% endif %}
+        <p class="user_id">{{ user_id }}</p>
+    </div>
+</div>