added nutshells for regression & classification

content/chapters/02_supervised_regression/02-00-nutshell-regression.md

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+---
+title: "Chapter 02.00: Supervised Regression: In a Nutshell"
+weight: 2000
+---
+In this nutshell chunk, we explore the fundamentals of supervised regression, where we teach machines to predict continuous outcomes based on input data.
+
+<!--more-->
+
+### Lecture video
+
+{{< video id="jGxycO-QkM4" >}}
+
+### Lecture slides
+
+{{< pdfjs file="https://github.com/slds-lmu/lecture_i2ml/blob/master/slides-pdf/slides-regression-nutshell.pdf" >}}

content/chapters/03_supervised_classification/03-00-nutshell-classification.md

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+---
+title: "Chapter 03.00: Supervised Classification: In a Nutshell"
+weight: 3000
+---
+In this nutshell chunk, we delve into the basics of supervised classification, where we train machines to categorize input data into predefined labels.
+
+<!--more-->
+
+### Lecture video
+
+{{< video id="x8TG-Jrb_80" >}}
+
+### Lecture slides
+
+{{< pdfjs file="https://github.com/slds-lmu/lecture_i2ml/blob/master/slides-pdf/slides-classification-nutshell.pdf" >}}