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/prompt-personal-item.html

@@ -0,0 +1,15 @@
+<div class="prompt-list-item">
+<button type="button"
+        class="prompt-select js-open-prompt"
+        data-kind="personal"
+        data-id="{{id}}">
+<span class="prompt-name">{{name}}</span>
+<span class="prompt-subline">{{metadata}}</span>
+</button>
+<form method="post" action="/prompts?lang={{language_url}}&mode=personal"
+      onsubmit="return confirm({{{confirm_json}}});">
+<input type="hidden" name="action" value="delete_prompt">
+<input type="hidden" name="prompt_id" value="{{id}}">
+<button type="submit">{{delete_label}}</button>
+</form>
+</div>