fix(guide): simplify directory structure

guide/english/bash/bash-mkdir/index.md

@@ -0,0 +1,22 @@
+---
+title: Bash mkdir
+---
+
+## Bash command: mkdir
+
+**Creates a directory**
+
+```
+mkdir directory_name
+```
+
+Make directory(ies) with the provided name if they do not already exist.
+
+Commonly used options:
+- `-p` no error if existing, make parent directories as needed.
+- `-v` prints message for each created directory.
+
+Let's say we need to create a directory `dir` in the path `a/b/c/dir`, but directory `b` and `c` don't exist. In this case, `mkdir -p a/b/c/dir` will create the missing directories in the path.
+
+### More Information:
+* [Wikipedia - Mkdir](https://en.wikipedia.org/wiki/Mkdir)