Make SQLite store default for new installations starting 0.26 (#140)

src/pages/selfhosted/sqlite-store.mdx

@@ -1,8 +1,22 @@
 # Management SQLite store
 
 In NetBird, the Management system traditionally relies on JSON file storage.
-Starting from version [0.24.0](https://github.com/netbirdio/netbird/releases/tag/v0.24.0), we have introduced **experimental** support for SQLite.
+
+<Note>
+Starting from version [0.24.0](https://github.com/netbirdio/netbird/releases/tag/v0.24.0), 
+we have introduced support for SQLite.
 This addition aims to provide users with enhanced performance and scalability options.
+</Note>
+
+<Note>
+Starting from version [0.26.0](https://github.com/netbirdio/netbird/releases/tag/v0.26.0), 
+SQLite is **a default** storage engine for new installations. 
+Please follow this manual if you insist on migrating from JSON file storage.
+If you have new installation you already have SQLite. To confirm please check the `management` logs on startup:
+```
+2024-02-06T15:28:04Z INFO management/server/store.go:77: using SQLite store engine
+```
+</Note>
 
 ## SQLite entity relationship diagram