Update CI build status badges

Remove the obsolete Travis and Jenkins continuous integration status
badges from the README and add ones for Gitlab and Github.

Author: rillian

README.md

@@ -1,7 +1,8 @@
 # Ogg
 
-[![Travis Build Status](https://travis-ci.org/xiph/ogg.svg?branch=master)](https://travis-ci.org/xiph/ogg)
-[![Jenkins Build Status](https://mf4.xiph.org/jenkins/job/libogg/badge/icon)](https://mf4.xiph.org/jenkins/job/libogg/)
+[![GitLab Pipeline Status](https://gitlab.xiph.org/xiph/ogg/badges/main/pipeline.svg)](https://gitlab.xiph.org/xiph/ogg/pipelines)
+[![GitHub CI Autotools build](https://github.com/xiph/ogg/actions/workflows/autotools.yml/badge.svg)](https://github.com/xiph/ogg/actions/workflows/autotools.yml)
+[![GitHub CI CMake build](https://github.com/xiph/ogg/actions/workflows/cmake.yml/badge.svg)](https://github.com/xiph/ogg/actions/workflows/cmake.yml)
 [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/xiph/ogg?branch=master&svg=true)](https://ci.appveyor.com/project/rillian/ogg)
 
 Ogg project codecs use the Ogg bitstream format to arrange the raw,