Add Zenodo badge

and remove defunct internal link. [ci skip]

README.md

@@ -1,5 +1,6 @@
 # ci_watson
 
+[![DOI](https://zenodo.org/badge/143923649.svg)](https://zenodo.org/doi/10.5281/zenodo.12699836)
 [![CI Status](https://github.com/spacetelescope/ci_watson/workflows/CI/badge.svg)](https://github.com/spacetelescope/ci_watson/actions)
 [![Documentation Status](https://readthedocs.org/projects/ci-watson/badge/?version=latest)](https://ci-watson.readthedocs.io/en/latest/?badge=latest)
 
@@ -8,7 +9,6 @@ If you ask nicely, it might also help you solve crimes.
 
 Nightly regression test results are available only from within the STScI
 network at this time.
-https://plwishmaster.stsci.edu:8081/job/RT/job/ci_watson/test_results_analyzer/
 
 ## Installation ##