This removes Gulp and introduces a number of new
technologies. The build process is now handled by
esbuild, SASS, and a number of new technologies.
Instead of running `gulp` to compile assets, the
command `yarn run choco-theme` is now used. By
running this, all necessary files are put in place
and CSS is purged.

This upgrades Bootstrap to 5.3.x. A large effort
was made to update choco-theme to use Bootstraps
css variables and dark mode settings. This will
help future upgrades to Bootstrap and choco-theme.

This also adds new social media icons and adjusts
old ones.

Choco-theme and any projects that use choco-theme
will now use Yarn 4.1.x. This upgrade will reduce
security vulnerabilities and improve performance.