Update seminar.md

2 jobs for master in 53 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Deploy
failed deploy_staging #3385

00:00:53

failed deploy_staging #3384

00:01:05

 
Name Stage Failure
failed
deploy_staging Deploy
$ ssh-add <(echo "$SSH_PRIVATE_KEY")
Identity added: /dev/fd/63 (/dev/fd/63)
$ mkdir -p ~/.ssh
$ [[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config
$ bundle exec jekyll build -d _site
Configuration file: /builds/SIGMathLing/website/_config.yml
jekyll 3.9.0 | Error: wrong number of arguments (given 2, expected 1)
Cleaning up file based variables
ERROR: Job failed: exit code 1