Petros Giouroukis issues

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                                            Petros Giouroukis

Fixed a small typo in App.js

Next and Previous Buttons don't appear

I just copied and pasted the "Setup your tour" code sample, and there are no "next" or "prev" buttons at all. Everything is included properly. Everything else seems to work...

[QUESTION] Missing Σ (sigma) symbol in Unit 4 "Gradient Ascent and the Policy-gradient Theorem"

I am referring to [this section](https://huggingface.co/learn/deep-rl-course/unit4/policy-gradient#gradient-ascent-and-the-policy-gradient-theorem) and specifically to this image: ![image](https://huggingface.co/datasets/huggingface-deep-rl-course/course-images/resolve/main/en/unit6/policy_gradient_theorem.png) Shouldn't there be a Σ (sigma) symbol right before the gradient operator? For reference, here is how the...