[DOC] Removed reference to supervised regression notebook

[danielroberts20]

Reference Issues/PRs

Fixes #2063

What does this implement/fix? Explain your changes.

Removes the reference to a separate notebook on supervised regression (TSFR) as per the advice of @TonyBagnall.

Does your contribution introduce a new dependency? If yes, which one?

No

Any other comments?

This is my first contribution to aeon and to any open-source software, with the aim of seeing what the process of contributing looks like.

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[danielroberts20]

@all-contributors please add @danielroberts20 for doc

[allcontributors]

@danielroberts20

I've put up a pull request to add @danielroberts20! 🎉

[TonyBagnall]

not sure whats going on with pre-commit!