Corrected links in old Demos

[ikurecic]

Fixing issues with links to in-page section anchors.

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[Qottmann]

not sure whats going on here, seems to be unrelated to this PR though

Traceback (most recent call last): File "/home/runner/work/qml/qml/venv/lib/python3.10/site-packages/sphinx/config.py", line 350, in eval_config_file exec(code, namespace) File "/home/runner/work/qml/qml/conf.py", line 21, in from pennylane import PennyLaneDeprecationWarning ModuleNotFoundError: No module named 'pennylane'

[ikurecic]

not sure whats going on here, seems to be unrelated to this PR though

Traceback (most recent call last): File "/home/runner/work/qml/qml/venv/lib/python3.10/site-packages/sphinx/config.py", line 350, in eval_config_file exec(code, namespace) File "/home/runner/work/qml/qml/conf.py", line 21, in from pennylane import PennyLaneDeprecationWarning ModuleNotFoundError: No module named 'pennylane'

Yikes. Yeah, it seems to be unrelated. I'll follow up. Thanks!

[DSGuala]

When I tested locally, keeping the two slashes allows the link to point to the demo, but one slash just doesn't show up as a link.

[josh146]

For cross-referencing sections, I don't think this is allowed syntax with Sphinx 🤔 (but could be wrong). Instead, I typically use :ref:

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• Pull Request ID: 1173
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[DSGuala]

For cross-referencing sections, I don't think this is allowed syntax with Sphinx 🤔 (but could be wrong). Instead, I typically use :ref:

~I couldn't find existing examples of :ref:`...#` to a section :thinking:~ Edit: realized we don't use # for :ref: :sweat_smile:

Found some broken :ref: links.

• https://pennylane.ai/qml/demos/tutorial_quantum_chemistry/ :ref:`hamiltonian`-
• https://pennylane.ai/qml/demos/tutorial_quantum_natural_gradient/ :ref:`Concepts section <glossary_variational_circuit>`

[ikurecic]

I just made the links external, it seems like that works reliably at the moment.