Publish a new version of the Ops Manager docs

Welcome to the docs-ops-manager wiki! The current process for publishing a new version of the docs is as follows:

1. On GitHub, create a new branch from dev and call it the new version number (e.g. 1.11)
2. Check out the new branch and do the following updates:
   • update the version in antora.yml
   • update the sitemap_version in preview.yml
   • add the new version to the list of published branches and update the sitemap_version in publish.yml
3. On TeamCity, update the ops-manager-branch parameter in the Generate HTML job (https://live.neo4j-build.io/admin/editBuildParams.html?id=buildType:Documentation_AntoraForOpsManager_GenerateHtml)
4. Repoint current to the new version in the versions.json file in the manual-modeling-antora repo (raise a PR on dev and cherry-pick to master)
5. On TeamCity, run the Publish Docs Versions json (https://live.neo4j-build.io/buildConfiguration/Documentation_AntoraForNeo4jDocs_Publish_PublishDocsVersions)