Bootcamp II is a wordpress theme (as well as an inside joke) designed to suit the needs of foothillschurch.com. It makes use of webpack, Babel, Sass, Tailwind, Browsersync, PostCSS, ESLint, Stylelint, Prettier and more. It is meant for that site, but if you can use it by all means go for it.
https://github.com/Myzwer/foothillschurch/blob/d75494784caf988edbcdb95afebe7becdca009e7/assets/src/js/frontend.js#L10-L11
I believe if you add
e.preventDefault()here it should stop adding#!to the url when you click on a dropdown nav item.