Hello @toneman1984, welcome to the GitHub Support Community!
From what I can tell, it appears to be a pathing issue. Remove the forward slash at the beginning of each resource and it should start working again. For example, change:
<link rel="stylesheet" href="/assets/vendor/bootstrap/css/bootstrap.min.css">
<link rel="stylesheet" href="assets/vendor/bootstrap/css/bootstrap.min.css">
If the changes do not take effect after pushing them online, you may need to wait a few minutes or clear your browser cache/cookies.
Just realized you’re using Jekyll. You should be able to adjust the pathes to the resources by editing the head.html file in the _includes folder. Remove the forward slash from the beginning of each
/assets instance and you should be golden. Might want to check the other templates for this as well.