Fix typo 'insisght' to 'insight'
Fixed a typo found on the website: https://about.gitlab.com/stages-devops-lifecycle/manage/
Typo: 'GitLab helps teams manage and optimize their software delivery lifecycle with metrics and value stream insisght in order to streamline and increase their delivery velocity.'
Correction: 'insisght' to 'insight'
Edited by Carla Erasmus