fix(gnoweb): escape bash chars in help args

[alexiscolin]

This PR ensures that special characters like ! and ? in user inputs are properly escaped when generating commands in the docs page ($help). Previously, entering ! or any other special char could cause the command string to break by omitting a closing ", making it invalid.

This fix applies proper escaping to prevent such issues, ensuring that generated commands remain valid and executable.

The fix introduces an escaping function that handles shell-sensitive characters before inserting them into the generated command strings. This approach ensures the commands remain intact without affecting their output when executed. Thus, the escape char is also removed from the cmd when the shell-sensitive char is removed from the arg input.

cf: issue 3355

[Gno2D2]

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