Questions Regarding an Upgrade from 0.5.0 to 0.8.15

I've been refactoring a smart contract suite from quite some time ago (solidity 0.5.0) into 0.8.15 and I can't find some of the contracts that I used at the time.

For example, was ERCMintable/ERCDetailed removed?

What about Crowdsale/MintedCrowdsale?

I am also looking for Secondary.sol...found in this article: