Updating breadcrumbs docs on ConditionalRender (#1871)

Author: Stephen-X

docs/features/breadcrumbs.md

@@ -19,7 +19,6 @@ Component.Breadcrumbs({
   spacerSymbol: "❯", // symbol between crumbs
   rootName: "Home", // name of first/root element
   resolveFrontmatterTitle: true, // whether to resolve folder names through frontmatter titles
-  hideOnRoot: true, // whether to hide breadcrumbs on root `index.md` page
   showCurrentPage: true, // whether to display the current page in the breadcrumbs
 })
 ```

docs/layout-components.md

@@ -81,4 +81,13 @@ Component.ConditionalRender({
 })
 ```
 
-This example would only render the Search component when the page is not in fullpage mode.
+The example above would only render the Search component when the page is not in fullpage mode.
+
+```typescript
+Component.ConditionalRender({
+  component: Component.Breadcrumbs(),
+  condition: (page) => page.fileData.slug !== "index",
+})
+```
+
+The example above would hide breadcrumbs on the root `index.md` page.