Improve code boxes highlighting

[pavlenex]

Currently code is not rendered properly.

Preview

We have to add that so that code tutorials visibility is better. Good example is what LDK does or what BTCPay Server does

[joshr4]

Code highlighting can be enabled by adding a language after the markdown triple backticks - https://prismjs.com/#supported-languages

I only see code snippets in your recent PR - https://github.com/stratum-mining/stratumprotocol.org/pull/142

[Abhijay007]

@pavlenex any assistance required on this one? or is it gonna covered in one of your open PRs?

[pavlenex]

@Abhijay007 I just got help from @dennisreimann on this one ,he suggested this, which I'll now add in my PR #142

code {
  font-size: .9em;
  background-color: #282c34;
  padding: .2em .4em;
  border-radius: .5em;
}