Update JN 7.0 to release candidate and Install Jupyter Lab Theme editor in a11y hub #4662
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For testing purpose
https://blog.jupyter.org/a-theme-editor-for-jupyterlab-8f08ab62894d
https://pypi.org/project/jupyter-theme-editor/#history
https://github.com/jupyter/notebook/releases/tag/v7.0.0rc0