main - 02d703b docs: consolidate theming guides (#29988)

Author: andrewseguin

docs-content/guides/customizing-component-styles.html

@@ -19,7 +19,7 @@ <h2 id="install-schematics" class="docs-header-link">
 <ul>
 <li>Ensure <a href="guide/getting-started#step-1-install-angular-material-angular-cdk-and-angular-animations">project dependencies</a> are placed in <code>package.json</code></li>
 <li>Enable the <a href="guide/getting-started#step-2-configure-animations">BrowserAnimationsModule</a> in your app module</li>
-<li>Add either a <a href="guide/theming#pre-built-themes">prebuilt theme</a> or a <a href="guide/theming#defining-a-custom-theme">custom theme</a></li>
+<li>Add either a prebuilt theme or a custom theme</li>
 <li>Add Roboto fonts to your <code>index.html</code></li>
 <li>Add the <a href="guide/getting-started#step-6-optional-add-material-icons">Material Icon font</a> to your <code>index.html</code></li>
 <li>Add global styles to<ul>