Astra Premium Sites 4.4.8

- Improvement: Updated page builder selection screen UI.
- Improvement: Showing import process on separate window. In which we can see all the current import process.
- Improvement: Added one time welcome notice after plugin install and activate.
- Improvement: Used fetch() instead of AJAX to load the Astra Sites. Also, Caching the Astra sites response and initially showing 30 sites.

- Improvement: One click install and activate Astra theme on click on admin notice.

- Improvement: Set the max height for the website image from the website preview window.