remove broken code from docs

[joamatab]

Summary by Sourcery

Documentation:

• Remove the broken tutorials for lumerical and schematic-driven layout from the documentation

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes broken links and outdated content from the documentation, specifically focusing on Lumerical Interconnect examples that are no longer valid or maintained.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed the Lumerical Interconnect notebook from the circuits documentation.	Removed the notebooks/lumerical_2_interconnect file reference from the plugins_circuits section.	docs/_toc.yml
Removed the Lumerical-related schematic driven layout notebook.	Removed the notebooks/21_schematic_driven_layout_lumerical file reference from the sdl section.	docs/_toc.yml

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