text: Title: tip on installing ploomber in the process running jupyterlab
  Body: [here](https://docs.ploomber.io/en/latest/user-guide/jupyter.html#activating-the-jupyter-extension) we have a big note that explains that the process running jupyter must have ploomber installed (users may only install it in the kernel), but we're missing links from other sections to that one
  
  we should mention that here: https://docs.ploomber.io/en/latest/user-guide/jupyter.html#troubleshooting-pipeline-loading
  
  also, we should link from this section to the troubleshoot section: https://docs.ploomber.io/en/latest/user-guide/jupyter.html#activating-the-jupyter-extension
  
  we should also link from here: https://docs.ploomber.io/en/latest/get-started/basic-concepts.html#the-cell-injection-process to the troubleshooting section