GCP - Documentation

- [ ] Remove install, uninstall, and update redirects in .gitbook.yaml

- [ ] Search the codebase and update accordingly (i.e. either point to install, aws/install, or gcp/install): `aws/install`, `install.md`, `aws/update`, `update.md`, `aws/uninstall`, `uninstall`

- [ ] Make sure links like this one work: `https://docs.cortex.dev/v/%s/gcp/install`

- [ ] What should be done with local?