feat(graphics): improve rendering pipeline and docs

- Refactor D3D12 backend and RenderGraph module
- Update graphics RHI and core rendering components
- Add Random.hlsl shader include
- Regenerate API documentation and update user guides

doc/_site/toc.html

@@ -0,0 +1,25 @@
+
+<div id="sidetoggle">
+  <div>
+    <div class="sidefilter">
+      <form class="toc-filter">
+        <span class="glyphicon glyphicon-filter filter-icon"></span>
+        <span class="glyphicon glyphicon-remove clear-icon" id="toc_filter_clear"></span>
+        <input type="text" id="toc_filter_input" placeholder="Filter by title" onkeypress="if(event.keyCode==13) {return false;}">
+      </form>
+    </div>
+    <div class="sidetoc">
+      <div class="toc" id="toc">
+
+          <ul class="nav level1">
+                <li>
+                    <a href="docs/getting-started.html" name="docs/toc.html" title="Docs">Docs</a>
+                </li>
+                <li>
+                    <a href="api/Ghost.Entities.html" name="api/toc.html" title="API">API</a>
+                </li>
+          </ul>
+      </div>
+    </div>
+  </div>
+</div>