chore: update ROADMAP.md

update links and reorder the contents

ROADMAP.md

@@ -1,2 +1,3 @@
-# Find information about our official [AppFlowy public roadmap](https://appflowy.gitbook.io/docs/essential-documentation/roadmap) on Gitbook.
-Our [roadmap](https://appflowy.gitbook.io/docs/essential-documentation/roadmap) is where you can learn about the features we’re working on, their status, when we expect to release them, and how you can help us. 
+## Our [roadmap](https://github.com/orgs/AppFlowy-IO/projects/5/views/12) is where you can learn about the features we’re working on, their status, when we expect to release them, and how you can help us. 
+
+## Find more information about how to use our official AppFlowy public roadmap on [Gitbook](https://appflowy.gitbook.io/docs/essential-documentation/roadmap).