Docs update (#5158)

## Description

1.0.169 changes: https://github.com/cosmos/vuepress-theme-cosmos/pull/84
- update newsletter signup form: zoho → mailerlite
- disable topbar banner

docs/.vuepress/config.js

@@ -16,6 +16,9 @@ module.exports = {
     docsDir: "docs",
     editLinks: true,
     label: "core",
+    topbar: {
+      banner: false,
+    },
     sidebar: {
       auto: true,
       nav: [