Provide a link to the installation requirement docs in the install page
## Proposal On the current installation page, we don't mention the software and hardware requirement for installation. It would be easier for users if there's a link to the docs https://docs.gitlab.com/ee/install/requirements.html and they could go through it before they choose the distribution. ![Screenshot_2021-12-17_at_15.13.11](/uploads/3b8a85de5980704cdcd07963e9605f34/Screenshot_2021-12-17_at_15.13.11.png)
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