docs: sidebar and navbar frontmatter config (vuejs#2667)

Co-authored-by: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>

Author: camera-2018

docs/reference/frontmatter-config.md

@@ -111,6 +111,32 @@ Defines contents of home hero section when `layout` is set to `home`. More detai
 
 Defines items to display in features section when `layout` is set to `home`. More details in [Default Theme: Home Page](./default-theme-home-page).
 
+### navbar <Badge type="info" text="default theme only" />
+
+- Type: `boolean`
+- Default: `true`
+
+Whether to display [navbar](./default-theme-nav).
+
+```yaml
+---
+navbar: false
+---
+```
+
+### sidebar <Badge type="info" text="default theme only" />
+
+- Type: `boolean`
+- Default: `true`
+
+Whether to display [sidebar](./default-theme-sidebar).
+
+```yaml
+---
+sidebar: false
+---
+```
+
 ### aside <Badge type="info" text="default theme only" />
 
 - Type: `boolean | 'left'`
@@ -140,7 +166,7 @@ The levels of header in the outline to display for the page. It's same as [confi
 - Type: `boolean`
 - Default: `true`
 
-Whether to display [Last Updated](./default-theme-last-updated) text in the footer of the current page.
+Whether to display [last updated](./default-theme-last-updated) text in the footer of the current page.
 
 ```yaml
 ---
@@ -153,7 +179,7 @@ lastUpdated: false
 - Type: `boolean`
 - Default: `true`
 
-Whether to display [Edit Link](./default-theme-edit-link) in the footer of the current page.
+Whether to display [edit link](./default-theme-edit-link) in the footer of the current page.
 
 ```yaml
 ---
@@ -166,10 +192,10 @@ editLink: false
 - Type: `boolean`
 - Default: `true`
 
-Whether to display [Footer](./default-theme-footer) in the footer of the current page. 
+Whether to display [footer](./default-theme-footer). 
 
 ```yaml
 ---
 footer: false
 ---
-```
+```