dnf-install: add page

pages/linux/dnf-install.md

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+# dnf install
+
+> Install packages on Red Hat-based distributions.
+> More information: <https://dnf.readthedocs.io/en/latest/command_ref.html#install-examples>.
+
+- Install packages by name:
+
+`sudo dnf {{[in|install]}} {{package1 package2 ...}}`
+
+- Install a package from a local file:
+
+`sudo dnf {{[in|install]}} {{path/to/file}}`
+
+- Install a package from the internet:
+
+`sudo dnf {{[in|install]}} {{https://example.com/package.rpm}}`
+
+- Add the Extra Packages for Enterprise Linux (EPEL) repositories:
+
+`sudo dnf {{[in|install]}} https://dl.fedoraproject.org/pub/epel/epel-release-latest-10.noarch.rpm`
+
+- Add Remi's RPM repository:
+
+`sudo dnf {{[in|install]}} https://rpms.remirepo.net/enterprise/remi-release-8.rpm`