feat: add maintain customer video guide

Author: ngyinze

docs/quick-start/customer/maintain-customer/how-to-maintain-customer.md

@@ -0,0 +1,17 @@
+---
+sidebar_position: 1
+title: How To Maintain Customer
+description: How to maintain customer in SQL Accounting
+slug: /quick-start/customer/how-to-maintain-customer
+tags: ["Customer"]
+hide_title: true
+hide_table_of_contents: true
+sidebar_class_name: hidden-sidebar-items
+---
+
+import '@src/css/sidebar.css';
+import { YtLayout } from '@src/components/yt-layout';
+
+<YtLayout
+    videoId="oWBmQIovcrM"
+/>

docs/quick-start/customer/maintain-customer/intro.md

@@ -11,6 +11,11 @@ import {TOC} from '@src/components/toc.js';
 
 <TOC
 dataEntryList = {[
+{
+  "text": "Maintain Customer",
+  "link": "./how-to-maintain-customer",
+  "videoId": "oWBmQIovcrM"
+},
 {
   "text": "TIN Lookup Via Maintain Customer/Supplier",
   "link": "../e-invoice/how-to-tin-lookup-via-maintain-customer",