Move rendering into private templates

Add an explicit template renderer with HTML views and partials for the app, bootstrap, package, and catalog pages. Move shared reporting setup into config/reporting.php and relocate stylesheet assets under css/.

private/views/partials/index-generated-link.html

@@ -0,0 +1,11 @@
+<h3>{{generated_link_label}}</h3>
+<div class="generated-link-row">
+<a href="{{issued_link}}" target="_blank" rel="noopener noreferrer">{{issued_link}}</a>
+<button type="button"
+        class="js-copy-button"
+        data-copy-text="{{issued_link}}"
+        data-copy-label="{{copy_label}}"
+        data-copied-label="{{copied_label}}">
+{{copy_label}}
+</button>
+</div>