[Feature Request]: Update to Astro 5

[alec-c4]

Hi!
I'd like to ask you about plans to update to latest Astro. Current version is 5.1, but theme's code is locked to the 4.16.3.

[wozien]

+1

[jeff4]

+1

[luchoalarcon]

+1

[hoangmirs]

Created the PR here