fix more slugs

Author: Blargian

docs/guides/sre/index.md

@@ -1,5 +1,5 @@
 ---
-slug: /en/security-and-authentication
+slug: /security-and-authentication
 title: "Security and Authentication"
 description: "Landing page for Security and Authentication"
 ---

docs/migrations/index.md

@@ -1,5 +1,5 @@
 ---
-slug: en/migrations
+slug: migrations
 title: Migrations
 pagination_prev: null
 pagination_next: null

docs/migrations/postgres/index.md

@@ -1,5 +1,5 @@
 ---
-slug: en/migrations/postgresql
+slug: migrations/postgresql
 pagination_prev: null
 pagination_next: null
 title: PostgreSQL

sidebars.js

@@ -1578,7 +1578,7 @@ const sidebars = {
           type: "link",
           label: "Migration Guides",
           description: "Migrate your database to ClickHouse",
-          href: "/migrations/en/migrations"
+          href: "/docs/migrations/migrations"
         },
         {
           type: "link",
@@ -1707,7 +1707,7 @@ const sidebars = {
           type: "link",
           label: "Security and Authentication",
           description: "Secure your ClickHouse deployment",
-          href: "/docs/en/security-and-authentication"
+          href: "/docs/security-and-authentication"
         },
         {
           type: "link",