Fixed links and changed the way table of contents is handled

[benji-glitsos-ga]

Proposed changes

Fixed links and changed the way table of contents is handled. (I needed to change the 'toctrees' in order to add subheadings to the sidebar on the new DEA Knowledge Hub)

Closes issues (optional)

None

Checklist (replace [ ] with [x] to check off)

• [ ] Notebook created using the DEA-notebooks template
• [ ] Remove any unused Python packages from Load packages
• [ ] Remove any unused/empty code cells
• [ ] Remove any guidance cells (e.g. General advice)
• [ ] Ensure that all code cells follow the PEP8 standard for code. The jupyterlab_code_formatter tool can be used to format code cells to a consistent style: select each code cell, then click Edit and then one of the Apply X Formatter options (YAPF or Black are recommended).
• [ ] Include relevant tags in the final notebook cell (refer to the DEA Tags Index, and re-use tags if possible)
• [ ] Clear all outputs, run notebook from start to finish, and save the notebook in the state where all cells have been sequentially evaluated
• [ ] Test notebook on both the NCI and DEA Sandbox (flag if not working as part of PR and ask for help to solve if needed)
• [ ] If applicable, update the Notebook currently compatible with the NCI|DEA Sandbox environment only line below the notebook title to reflect the environments the notebook is compatible with

[review-notebook-app[bot]]

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