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-prompt-select.html

@@ -0,0 +1,21 @@
+<div class="bootstrap-prompt-tool">
+<label>
+{{select_prompt_label}}<br>
+<select id="bootstrapPromptSelect">
+{{{prompt_options_html}}}
+</select>
+</label>
+
+<textarea id="bootstrapPromptOutput" readonly rows="12"></textarea>
+
+<button type="button"
+        class="js-copy-button"
+        data-copy-target="bootstrapPromptOutput"
+        data-copy-label="{{copy_label}}"
+        data-copied-label="{{copied_label}}">
+{{copy_full_prompt_label}}
+</button>
+</div>
+<script type="application/json" id="bootstrapPromptData">
+{{{bootstrap_prompt_json}}}
+</script>