No copy button for code and code highlighting

[thisiskaransgit]

Issue :

• The Handbook doesn't have the copy button to copy and paste the code to your machine directly.
• The python code is not highlighted as the shortname used for the lexer is incorrect and thus the code is undetected.
• Wrong shortname for yaml files code highlighting.

Desired Behaviour:

• To have a copy button extension to directly copy and paste the code
• Syntax highlighting for python code
• Syntax highlighting for yaml code