feat(?): 📝Rewrite frontend content

[george112n]

[1] Bug Description
When I go to the website home page it still says "Build Teams" which is not conducive to the way BTE works, it's very confusing. All over the website it's called Build Teams which isn't what BTE calls it anymore since Solo building was scrapped 2 years ago.

[2] Screenshots

[3] Reproduction
Request the page at https://buildtheearth.net

[4] Expected Behaviour
It should show "Regions" everywhere.

[5] Additional context

[Nudelsuppe42]

We first need to think about this entire thing:
https://discord.com/channels/704929831246233681/1015624613352443994/1342936976848060532
otherwise it will not make any sense to rename just a single part while keeping everything else as it was 5 years ago.