Adding Kotlin to code/index.html.js

[wendreof]

Java and Kotlin are 100% interoperable!

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[carolstran]

👋🏼 Thanks for taking the time to open this pull request! We're currently re-evaluating how we handle contributions to this Code page and pausing any changes until after those decisions are made. So I'm going to mark this PR as On hold and if you have any thoughts on this topic, it'd be great if you could voice them in #911

[carolstran]

Hey hey 👋🏼 the Gatsby migration (#938) has been merged so now we can update the content again. Could you please resolve the conflicts on your branch?

[hwillson]

Thanks for this @wendreof and super sorry on the delay in responding. The site was overhauled after you opened this PR, and the Java section was updated to include Kotlin, so we should be all set here. Thanks!