Add notebook for loading models and low-dim UMAP embeddings

[siboehm]

Relevant for #82

This shows how to do a UMAP plot of the low dimension embedding generated by CCPA.

@MxMstrmn Just have a brief look at the list of files and then merge it. The notebook should have everything you need to make nice UMAP plots, I could already see quite some clustering happening in the seq2seq embedding.

I also did a bit of cleanup:

• Removed everything in notebooks/, since we've used non if it
• Removed all notebooks in preprocessing that are for different datasets
• Cleaned up the simon/ folder by deleting old yaml configs and moving important plotting scripts to my repo (mt_thesis)
• Add .py version of all remaining notebooks

[review-notebook-app[bot]]

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[MxMstrmn]

Looks good, I mainly payed attention to the once you deleted. Look good. Merging.