Reorder the linux file system information to reflect the same order (#142)

* Reorder the linux file system information to reflect the same order in the image.
* Pin jinja2<3.1.0 to prevent mkdocs from being broken

Co-authored-by: George Tony <gtony@gtony-mn1.linkedin.biz>

courses/level101/linux_basics/command_line_basics.md

@@ -35,21 +35,23 @@ files or user related files.
 
 ![](images/linux/commands/image17.png)
   
-  bin   | The executable program of most commonly used commands reside in bin directory  
-  
-  sbin  | This directory contains programs used for system administration.
-  
+  bin   | The executable program of most commonly used commands reside in bin directory
+
+  dev   | This directory contains files related to devices on the system  
+
+  etc   | This directory contains all the system configuration files
+
   home  | This directory contains user related files and directories.
-  
+
   lib   | This directory contains all the library files
-  
-  etc   | This directory contains all the system configuration files
-  
+
+  mnt   | This directory contains files related to mounted devices on the system
+
   proc  | This directory contains files related to the running processes on the system
   
-  dev   | This directory contains files related to devices on the system
+  root  | This directory contains root user related files and directories.
   
-  mnt   | This directory contains files related to mounted devices on the system
+  sbin  | This directory contains programs used for system administration.
   
   tmp   | This directory is used to store temporary files on the system
   

courses/level101/linux_basics/intro.md

@@ -79,7 +79,7 @@ and system utilities. The Linux kernel was independently developed and
 released by Linus Torvalds. The Linux kernel is free and open-source -
 [https://github.com/torvalds/linux](https://github.com/torvalds/linux)
 
-Linux is a kernel and and not a complete operating system. Linux kernel is combined with GNU system to make a complete operating system. Therefore, linux based operating systems are also called as GNU/Linux systems. GNU is an extensive collection of free softwares like compiler, debugger, C library etc.
+Linux is a kernel and not a complete operating system. Linux kernel is combined with GNU system to make a complete operating system. Therefore, linux based operating systems are also called as GNU/Linux systems. GNU is an extensive collection of free softwares like compiler, debugger, C library etc.
 [Linux and the GNU  System](https://www.gnu.org/gnu/linux-and-gnu.en.html)
 
 History of Linux -

requirements.txt

@@ -1,2 +1,3 @@
 mkdocs==1.1.2
 mkdocs-material==6.2.8
+jinja2<3.1.0