The only "perl" in the code I posted is the "print" statement - the remaining 99% is HTML, and shows how you can incorporate external CDN references to the jquery, bootstrap and tablesorter components.

It would not be practical to post the 5k line complete script from whence that snippet came.
Even if I did, it would raise a lot more questions than it answers - it is a hairy mess mixing up HTML, javascript and perl.
Today, I would not write a mess like that. So I certainly would not want it used as a sample to generate more such monstrosities.

To get familiar with Bootstrap, you need to work with plain HTML, javascript, jquery and bootstrap.

Only after you get your head around these, should you approach building your own monstrosity, or messing with someone elses.

I suggest you follow the advice posted belo this comment, and seek external assistance in getting your project into this decade.

Good luck.