Description of feature

The new cool workflow updating all PRs with the newest screen grabs is nice, but it comes with some side effects. Every time a commit is pushed to a PR there is a new PR by the bot. This then means that new push might fail and the whole PR has to be rebased or merged. Tis pollutes the commit history and complicates the development workflow. It would be nice to have this workflow as something that can be done "on demand" or just before merging, not with every commit pushed to the PR branch.