Update NPZ.md (resize the image)

[iuryt]

Not sure this is the best practice, but I noticed the NPZ image was too large and suggested to use <img> tag to resize the image. I used a size that the resulting text from the image is around the same size as the docs.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e1a9bbd) 63.82% compared to head (bce0658) 63.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #132 +/- ## ======================================= Coverage 63.82% 63.82% ======================================= Files 28 28 Lines 1020 1020 ======================================= Hits 651 651 Misses 369 369 ```

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[jagoosw]

Thank you. I'm not sure if it works in this version of markdown but you can sometimes do:

![alt text](url){width = "700px"}

[iuryt]

Thank you. I'm not sure if it works in this version of markdown but you can sometimes do:

![alt text](url){width = "700px"}

I tried that one and it didn't work on the preview tab, not sure if it would work for the docs then.