refactor sidemenu

[aothms]

Rebased commit #261 from https://github.com/semonw onto development

[Ghesselink]

Nice :-) I've also adjusted the items on the left for them to be more aligned

(was)

[Ghesselink]

Nice :-) I've also adjusted the items on the left for them to be more aligned

(was)

[semonw]

nice. since you have ajust the alignment, you can close this issue, to use your commit. I also abstracted the Menu Items.
const menuItems = [{ text: "Home", href: context.sandboxId ? /sandbox/${context.sandboxId}: "/", icon: <HomeIcon />, displayText: "Home", }, { text: "Dashboard", href: context.sandboxId ?/sandbox/dashboard/${context.sandboxId} : "/dashboard", icon: <CheckIcon />, displayText: "Validation", },];