Καλωσόρισες Σταμάτη, welcome to the forum 
The read-only links are indeed limited, included to how many tasks that will show within a project. See point 10. in my post here.
As an alternative, you could try Instagantt.com which works great with Asana and free for up to 3 projects. You can share your Gantt chart with anyone, either dynamically updated or a snapshot (Baseline) and it can also export/print a very decent-looking PDF.