steamos-{boot-install, devmode, finalize-install}, mount.steamos: add pages (#16750)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/mount.steamos.md

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+# mount.steamos
+
+> Mount or unmount SteamOS filesystem partitions.
+> More information: <https://gitlab.com/users/evlaV/projects>.
+
+- Mount all necessary partitions from a device to a target directory:
+
+`sudo mount.steamos {{/dev/sdX}} {{/mnt}}`
+
+- Mount with options to exclude specific partitions (e.g. `/home`, overlays):
+
+`sudo mount.steamos {{[-o|--options]}} nohome,nooverlay {{/dev/sdX}} {{/mnt}}`
+
+- Unmount all partitions mounted under a target directory:
+
+`sudo mount.steamos -u {{/mnt}}`
+
+- Display help:
+
+`mount.steamos {{[-h|--help]}}`

pages/linux/steamos-boot-install.md

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+# steamos-boot-install
+
+> This command is an alias of `steamos-finalize-install`.
+
+- View documentation for the original command:
+
+`tldr steamos-finalize-install`

pages/linux/steamos-devmode.md

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+# steamos-devmode
+
+> Enable SteamOS developer mode.
+> Note: Developer mode disables read-only protections and initializes the package manager.
+> More information: <https://gitlab.com/users/evlaV/projects>.
+
+- Enable developer mode:
+
+`sudo steamos-devmode enable`
+
+- Enable developer mode without confirmation prompt:
+
+`sudo steamos-devmode enable --no-prompt`
+
+- Check if developer mode is currently enabled:
+
+`sudo steamos-devmode status`

pages/linux/steamos-finalize-install.md

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+# steamos-finalize-install
+
+> Complete a SteamOS installation by setting up bootloaders and applying system updates.
+> More information: <https://gitlab.com/users/evlaV/projects>.
+
+- Finalize the installation:
+
+`sudo steamos-finalize-install`
+
+- Finalize without updating bootloaders or kernel:
+
+`sudo steamos-finalize-install --no-bootloaders --no-kernel`
+
+- Skip all migration steps:
+
+`sudo steamos-finalize-install --no-migrate`
+
+- Set a specific root hash during finalization:
+
+`sudo steamos-finalize-install --roothash {{hash}}`
+
+- Force system migration steps regardless of environment:
+
+`sudo steamos-finalize-install --force`