Add support for code block line highlighting comments

[meganesu]

As a content creator, I want a way to draw the reader's attention to a particular section of a code block.

Related to #62

API

Add the following comments to add line highlighting to your code blocks:

• highlight-line: highlight the current line
• highlight-next-line: highlight the following line
• highlight-start and highlight-end: highlight all the lines between the start and end comments

Example: highlight-line

const greeting = "Howdy" // highlight-line

const name = "Megan" // highlight-line
console.log(greeting, ", my name is ", name) // highlight-line

return true

Example: highlight-next-line

const greeting = "Howdy"

// highlight-next-line
const name = "Megan"
console.log(greeting, ", my name is ", name)

// highlight-next-line
return true

Example: highlight-start and highlight-end

const greeting = "Howdy"

// highlight-start
const name = "Megan"
console.log(greeting, ", my name is ", name)
// highlight-end

return true

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