Use javascript tags

[lfilho]

Research how to generally use ctags in vim and how the best way to use it with JS

[lfilho]

https://ricostacruz.com/til/navigate-code-with-ctags
https://github.com/ludovicchabant/vim-gutentags/

Support for ES2015 / ES.next are really poor still. There are efforts like https://github.com/okcompute/es-ctags but it's far from ideal as ctags presumes a single file (for CSS, JS, etc etc)