How do you handle 404 and redirects?

[jacekgetint]

Hi ;)
We're rewriting our docs, and we create a new structure.
This means, that some URLs will change, and some will be deleted.
We need to be able to create redirects so we'll be on the bright side of SEO. Plus, some older URLs that we want to delete are used in many places, and we don't know where. So we don't want to simply lose them, we need to redirect them to new places.
How to do it?
I've found this: https://docs.gitbook.com/integrations/git-sync/content-configuration#redirects but I'm not sure if that's what will solve this problem.
We're afraid that if we connect GitHub we can lose all the history, that we would have to continue writing docs in GitHub, and lose the option to work with Gitbook UI.
It would be amazing to have a simple table like in webflow - old link, new link, save :D .
So f.e. my old link was https://docs.getint.io/getting-started-with-the-platform/build-your-workflow/jira-azure-devops and the new one is https://docs.getint.io/getting-started-with-the-platform/integration-synchronization/jira-azure-devops-integration . How to make it work?