_layouts: add generic deprecated_url keys to moneropedia/user-guide

Author: plowsof

_layouts/moneropedia.html

@@ -11,6 +11,12 @@ <h1 class="text-center">{% t page.title %}</h1>
                             <h3 style="padding: 0;">⚠️ This page is deprecated</h3>
                             <p>The latest version of this document is available at <a href="{{ site.docsurl }}{{ page.deprecated_docs_url }}">Monero Docs</a>.</p>
                         </div>
+                    {% elsif page.deprecated_url %}
+                        <div class="info-block center-xs">
+                            <h3 style="padding: 0;">⚠️ {{ page.deprecated_title }}</h3>
+                            <p>{{ page.deprecated_body }} 
+                            <a href="{{ page.deprecated_url }}">{{ page.deprecated_url_label }}</a>.</p>
+                        </div>
                     {% endif %}
                    <h2>{% t page.entry %}</h2>
                     <div>

_layouts/user-guide.html

@@ -10,6 +10,12 @@
                             <h3 style="padding: 0;">⚠️ This page is deprecated</h3>
                             <p>The latest version of this document is available at <a href="{{ site.docsurl }}{{ page.deprecated_docs_url }}">Monero Docs</a>.</p>
                         </div>
+                    {% elsif page.deprecated_url %}
+                        <div class="info-block center-xs">
+                            <h3 style="padding: 0;">⚠️ {{ page.deprecated_title }}</h3>
+                            <p>{{ page.deprecated_body }} 
+                            <a href="{{ page.deprecated_url }}">{{ page.deprecated_url_label }}</a>.</p>
+                        </div>
                     {% endif %}
                     <div>
                         {{content}}