review projects that have been renamed or moved

[shiftkey]

These projects on Up for Grabs contain GitHub repositories that have been renamed transferred to different organizations recently:

Project _data/projects/kentico-gatsbystarterkenticocloud.yml needs to be updated from 'Kentico/gatsby-starter-kentico-cloud' to 'Kentico/gatsby-starter-kontent'

Project _data/projects/Mermaid.yml needs to be updated from 'knsv/mermaid' to 'mermaid-js/mermaid'

Project _data/projects/kentico-gatsbysourcekenticocloud.yml needs to be updated from 'Kentico/gatsby-source-kentico-cloud' to 'Kentico/gatsby-source-kontent'

The fix for this is to check each file and update all mentions of the old repository to the new location.