eselect-{kernel,profile}: add page (#13937)

pages/linux/eselect-kernel.md

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+# eselect kernel
+
+> An `eselect` module for managing the `/usr/src/linux` symlink.
+> More information: <https://wiki.gentoo.org/wiki/Eselect#Kernel>.
+
+- List available kernel symlink targets with their numbers:
+
+`eselect kernel list`
+
+- Set the `/usr/src/linux` symlink by name or number from the `list` command:
+
+`eselect kernel set {{name|number}}`
+
+- Show what the current kernel symlink points to:
+
+`eselect kernel show`
+
+- Set the kernel symlink to the currently running kernel:
+
+`eselect kernel update`

pages/linux/eselect-profile.md

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+# eselect profile
+
+> An `eselect` module for managing the `/etc/portage/make.profile` symlink, which sets the system profile.
+> More information: <https://wiki.gentoo.org/wiki/Eselect#Profile>.
+
+- List available profile symlink targets with their numbers:
+
+`eselect profile list`
+
+- Set the `/etc/portage/make.profile` symlink by name or number from the `list` command:
+
+`eselect profile set {{name|number}}`
+
+- Show the current system profile:
+
+`eselect profile show`