Add line numbers to code blocks

[JazielGuerrero]

Expected Behavior
Code blocks for Javascript/Typescript, Rust and YAML should display the line numbers

Actual Behavior
The line numbers are not displayed for code blocks

[TheDARKFURY]

@JazielGuerrero
How this can be done?
I tried doing this with a custom css code and also by using showLineNumbers tag but still it does not give the number of code lines inside a code block

[JazielGuerrero]

I created a PR that adds the line number to the quickstart. #19 basically, we need to add showLineNumbers after the language name (remember to add a space). I hope the PRs help you for reference.

[TheDARKFURY]

Done