Remove v8, build on Mac and update to v15

[CarlSargunar]

• Update the latest project to v15
• Remove the v8 version of the site
• Update and rename v13 site so all names are consistent
• Check it builds on all environments

[CarlSargunar]

While this works on windows for me, I tried it again on my M1, and I'm getting this building the v15 backoffice

Error: Cannot find module @rollup/rollup-darwin-arm64. npm has a bug related to optional dependencies (npm/cli#4828). Please try npm i again after removing both package-lock.json and node_modules directory.

The suggested fix doesn't work, looking into why

[CarlSargunar]

This looks to work well on windows, if it makes sense it might be an idea to merge this in for the restructure, and I'll sort out my build issues. From what I've read into it, It might be an issue of which architecture of node I have installed