feat(NcAppSidebar): provide 'noClose' prop for customization

Signed-off-by: Maksim Sukharev <antreesy.web@gmail.com>

Author: Antreesy

src/components/NcAppSidebar/NcAppSidebar.vue

@@ -665,7 +665,8 @@ export default {
 					</div>
 				</div>
 
-				<NcButton ref="closeButton"
+				<NcButton v-if="!noClose"
+					ref="closeButton"
 					:aria-label="closeTranslated"
 					:title="closeTranslated"
 					class="app-sidebar__close"
@@ -836,7 +837,14 @@ export default {
 			type: Boolean,
 			default: false,
 		},
-
+		/**
+		 * Do not show the close button for the sidebar.
+		 * @default false
+		 */
+		noClose: {
+			type: Boolean,
+			default: false,
+		},
 		/**
 		 * Force the actions to display in a three dot menu
 		 */