Split ELS for OS file into multiple

Author: sboldyreva

docs/.vuepress/config-client/sidebar.ts

@@ -30,6 +30,17 @@ export default {
             collapsable: false,
             children: [
                 "/els-for-os/",
+                "/els-for-os/centos-6-els/",
+                "/els-for-os/centos-7-els/",
+                "/els-for-os/centos-8-els/",
+                "/els-for-os/centos-stream-8-els/",
+                "/els-for-os/oracle-linux-6-els/",
+                "/els-for-os/oracle-linux-7-els/",
+                "/els-for-os/rhel-7-els/",
+                "/els-for-os/ubuntu-16-04-els/",
+                "/els-for-os/ubuntu-18-04-els/",
+                "/els-for-os/ubuntu-20-04-els/",
+                "/els-for-os/security-updates/",
             ]
         },
     ],

docs/.vuepress/theme/components/Breadcrumb.vue

@@ -23,6 +23,7 @@ const siteTitle = computed(() => site.value.title);
 const titleMap = {
   '/els-for-languages/': 'ELS for Languages',
   '/els-for-runtimes-and-libraries/': 'ELS for Runtimes & Libraries',
+  '/els-for-os/': 'ELS for OS',
 };
 
 const breadCrumbs = computed(() => {