MAINT: adding more generated content to gitignore

Author: bsipocz

.gitignore

@@ -97,3 +97,6 @@ site/notebooks/*
 content/mooreslaw_regression*
 content/tutorial-x-ray-image-processing/xray_image.gif
 content/video
+content/*ipynb
+content/tutorial-nlp-from-scratch/parameters.npy
+content/tutorial-nlp-from-scratch/*ipynb