Add reusable layout partials for easier page creation

- Create content-card-section.html partial for card-based content
- Create step-by-step-section.html partial for process steps
- Create contact-section.html partial for contact information
- Create main-content-section.html general purpose partial that combines all elements
- Add simplified examples using the new partials (acheter-credit-simple and commande-sim-simple)
- These partials follow the existing site theme and make creating new pages much faster

layouts/partials/contact-section.html

@@ -0,0 +1,27 @@
+{{ $title := .title | default "Informations de contact" }}
+{{ $contactInfo := .contactInfo }}
+
+<div class="container">
+  <div class="row">
+    <div class="col-12">
+      <div class="card">
+        <div class="card-body">
+          <h3>{{ $title }}</h3>
+          <div class="row">
+            {{ range $contactInfo }}
+            <div class="col-md-6">
+              <p><strong>{{ .title }}:</strong></p>
+              {{ if .icon }}
+              <p><img src="{{ .icon }}" alt="{{ .alt }}" class="mr-2" style="width: 20px;"> {{ .content }}</p>
+              {{ else }}
+              <p>{{ .content }}</p>
+              {{ end }}
+              {{ if .hours }}<p>{{ .hours }}</p>{{ end }}
+            </div>
+            {{ end }}
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>