Add support for secured sites and browsersync to vite (#307)

* Add type hints for vite

* Use valet cetificates in vite if the site is secured

* Install `vite-plugin-browser-sync` npm package

* Add npm script for vite with browsersync env variable

* Ensure vite uses current ip as host

* Add the browsersync plugin to vite if the env variable is present

* Remove unnecessary semicolons

* optimize ternary operator

* ensure browsersync is only used if device is connected to a network

* add whitespace after assignment operator

* open external url with browsersync