* Add back Data Prepper 1.4 docs (#698) * Add back Data Prepper 1.4 docs Signed-off-by: Naarcha-AWS <[email protected]> * Fix Data Prepper Docker image Signed-off-by: Naarcha-AWS <[email protected]> * Update GitHub links to `main` branches rather than `master` where it has been changed Signed-off-by: Naarcha-AWS <[email protected]> Co-authored-by: Aaron Carson <[email protected]>