refactor: moved back from specific folder as articles are not really os specific

knowledge base/lsblk.md

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+# `lsblk`
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+# Install the tool.
+dnf install 'util-linux'
+
+# Show information about block devices.
+lsblk
+lsblk -a
+
+# Also print other specific columns.
+# Mind the '+' character at the beginning.
+lsblk -o '+MODEL,SERIAL'
+
+# Show only physical disks
+lsblk -d
+
+# Filter by major device numbers.
+lsblk -I '8,259'
+```
+
+## Sources
+
+- [`man` page][man page]
+
+<!--
+  References
+  -->
+
+<!-- Others -->
+[man page]: https://linux.die.net/man/8/lsblk