Colours in our current bootstrap package are out of date with bootstrap 5 library

## Description
https://github.com/digitalspace/bcparks-bootstrap-theme/blob/master/scss/_variables.scss should match with [Colors](https://getbootstrap.com/docs/5.0/utilities/colors/)

Link in file is also broken, but no replacement has been found.

Open scss/_variables.scss and compare its color definitions with the Bootstrap 5 Colors documentation linked in the issue. Check the existing reference link, update the variables so they match the current Bootstrap colors, and confirm the file points to a valid replacement documentation URL.

Written by the indexing model from the issue text.