fixed cli toc and link

Author: mParkesUCL

lessons/_toc.yml

@@ -34,7 +34,7 @@ parts:
       sections:
       - file: solving_problems/errors_and_debug.ipynb
       - file: solving_problems/writing_a_program.ipynb
-      - file: solving_problems/command_line.ipynb
+      - file: solving_problems/command_line.md
     - file: common_libs/common_libraries.md
       sections:
       - file: common_libs/matplotlib_pyplot_basics.ipynb

lessons/solving_problems/command_line.md

@@ -20,7 +20,7 @@ On Linux it will depend on your distro. Generally look for an app called one of
 
 Once opened we can do various things. Initially it should look something like this:
 
-![An image of a terminal with just the current directory showing](/lessons/solving_problems/images/term_1.png)
+![An image of a terminal with just the current directory showing](/solving_problems/images/term_1.png)
 
 Depending on the 'shell' that you have you might have more information, such as your user name. We can now enter commands into this prompt.