Update TOC. [skip ci]

README.md

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-*Stanford OpenLDAP in Container*
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-- [Stanford OpenLDAP in Container](#stanford-openldap-in-container)
-- [Get and setup personal drone token](#get-and-setup-personal-drone-token)
-- [Turn on the ci job defined in .drone.yml](#turn-on-the-ci-job-defined-in-droneyml)
-- [Update OpenLdap image](#update-openldap-image)
-    - [Manual push to Google container registry](#manual-push-to-google-container-registry)
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