THM Room : Git Happens
You can also browse through the site pages to find hints. However i couldn't find anything relevant. I found some logs though.
I used gitdumper.sh script to dump all the items to my local machine. Link (https://raw.githubusercontent.com/internetwache/GitTools/master/Dumper/gitdumper.sh)
Go through the logs to find the commit history (reference : https://git-scm.com/book/en/v2/Git-Basics-Viewing-the-Commit-History)
You can find the credentials in the index.html file. The password is the flag.