Highlight command line components in color

[anazarov79]

Command line components should have a color difference on web pages. This should also be done for pieces of the program text for various languages (Python, Solidity, Rust, bash, for example).

npm install <options>

[anazarov79]

Command line items are now highlighted for the line marked "bash". Marking the command line as "sh" does not work.

[anazarov79]

I would also like to change the background of CLI to a dark one, as it is now done in solana docs