Any ideas where the errors are coming from? I realize the ajax and bootstrap CDN URLs are incorrect, but I am not sure where they are to change them. The error happens on every page in the collection
You don't have enough information here to really solve the issue. My guess is that eithe you have a custom masterpage or a CEWP on the page that points to a text file that's in the Style Library or some other location. If the code in that location used the //maxcdn.... method of referencing the files, instead of https://maxcdn... then SharePoint will often automatically "fix" your url by appending the root host name of the site in your file. I would first figure out if the modifications are part of the masterpage or if there is a CEWP/SEWP on the page (it looks like the latter but i'm just guessing) and then if it's a CEWP look at the referenced file, or if it's a SEWP look at the code and see if you can see the damaged URLs.