message: docs: Update gentoo install instructions
diff: @@ -180,21 +180,10 @@ sudo dnf install bottom
  ### Gentoo
  -Available in [GURU](https://wiki.gentoo.org/wiki/Project:GURU) and [dm9pZCAq](https://github.com/gentoo-mirror/dm9pZCAq) overlays:
  +Available in the official Gentoo repo:
  ```bash
  -sudo eselect repository enable guru
  -sudo emerge --sync guru
  -echo "sys-process/bottom" | sudo tee /etc/portage/package.accept_keywords/10-guru
  -sudo emerge sys-process/bottom::guru
  -```
  -
  -or
  -
  -```bash
  -sudo eselect repository enable dm9pZCAq
  -sudo emerge --sync dm9pZCAq
  -sudo emerge sys-process/bottom::dm9pZCAq
  +sudo emerge --ask sys-process/bottom
  ```
  ### Nix
  