That's a bit of an unfair comparison - that's the GitLab instructions to install from source. Most people use a package (rpm, deb) to install GitLab.
The installation instructions for GitLab from prebuilt binaries is https://about.gitlab.com/install/, and that's significantly shorter.
That said, I think for most home applications, GitLab is hugely overkill.
I assume that's to build from source.
The times I've installed GitLab it's been a case of
dnf install https://.... The rest gets dragged in automatically.