Have only one paul_graham_essays folder

[joeferraratonic]

There's currently a paul_graham_essays folder in the examples folder that contains 6 essays used for the quickstart example notebook and another paul_graham_essays folder in the titan_vs_cohere folder that contains all the Paul Graham essays (many more than 6), which are used in our head to head RAG evaluation blog posts. Having two folders with the same name and different content creates confusion. They should be consolidated into one folder.