Set Mirantis theme on Jenkins

Change-Id: I9a9a2593bcfdb0e828102bd758503f78a5cc79b2
Related-prod: #PROD-25516 (PROD:25516)
(cherry picked from commit 60c779c5081f008b33bd764810f026bab3c6b8b9)
diff --git a/jenkins/client/init.yml b/jenkins/client/init.yml
index 0bb19db..59faa0b 100644
--- a/jenkins/client/init.yml
+++ b/jenkins/client/init.yml
@@ -26,6 +26,9 @@
           url: ${_param:jenkins_gerrit_url}/mcp-ci/pipeline-library
           credential_id: gerrit
           branch: ${_param:jenkins_pipelines_branch}
+      theme:
+        css_url: '/userContent/theme/mirantis.css'
+        js_url: '/userContent/theme/mirantis.js'
       view:
         Mirrors:
           enabled: true