fix(guide): simplify directory structure

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

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+---
+title: Bash Man
+---
+
+## Man
+
+Man, the abbreviation of **man**ual, is a bash command used to display on-line reference manuals of the given command.
+
+Man displays the reletive man page (short for **man**ual **page**) of the given command.
+
+### Usage
+
+```bash
+man [options] [command]
+```
+
+Most used options:
+
+* `-f`, print a short description of the given command
+* `-a`, display, in succession, all of the available intro manual pages contained within the manual
+
+### Example
+
+Display the man page of ls:
+
+```bash
+man ls
+```
+
+#### More information:
+
+* Wikipedia: https://en.wikipedia.org/wiki/Man_page