Modernize Installation Guide (#8168)

* Cleaning up installation page

* Update docs/en/installation.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update docs/en/installation.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Clarify recommended composer version constraints

* Improve permission setting part

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: josbeir