Off-by-one on the sidebar navigation links

[brettgoulder]

For example, if you go to this link: https://survey.stateofjs.com/survey/state-of-js/2020/read-only/1 "Syntax" is highlighted in the navigation, but the content will display "Language". Pictured below:

I think this is just an issue with zero indexing, because if you manually change "1" to "0" in the URL, it'll correctly show "Syntax".