Astroid Framework Version 2.5.5

[update] Migrate to Bootstrap 5
[update] Update Social layout
[update] Update Blog post type
[update] Update Astroid Information
[add] Add Stacked Center Balance header
[add] Add Column Order in Responsive layout
[add] Add Color option for Back to top icon
[fixbug] Fix PHP warning when Itemid is null
[fixbug] Fix PHP warning when system redirect to admin login
[fixbug] Fix 404 error when load cassiopeia/css/vendor/fontawesome-free/fontawesome.min.css