So I went back and finished the steps needed to get teampass installed. Once I got the selinux permissions sorted, it seems to run just fine. I guess you are right that mcrypt is no longer required and it's just the documentation that needs updating. As for current development, I see there is at least current activity, even if it doesn't look very active.

Thanks for your help.

I did not actually try installing it without mcrypt. I was working from the list of requirements on the github teampass page where it lists mcrypt as a required php extension. I will see if it works without mcrypt on my server...