Organized setup instructions (#115)

* Organized setup instructions

* update tets

* link checker action

* raise error upon broken link

* fix links

* fix links

* delete duplicated paragraph

setup/02_installing-python-libraries/python_environment_check.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "c31e08b0-f551-4d67-b95e-41f49de3b392",
+   "metadata": {},
+   "source": [
+    "<font size=\"1\">\n",
+    "Supplementary code for \"Build a Large Language Model From Scratch\": <a href=\"https://www.manning.com/books/build-a-large-language-model-from-scratch\">https://www.manning.com/books/build-a-large-language-model-from-scratch</a> by <a href=\"https://sebastianraschka.com\">Sebastian Raschka</a><br>\n",
+    "Code repository: <a href=\"https://github.com/rasbt/LLMs-from-scratch\">https://github.com/rasbt/LLMs-from-scratch</a>\n",
+    "</font>"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "67f6f7ed-b67d-465b-bf6f-a99b0d996930",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[OK] Your Python version is 3.10.12\n",
+      "[OK] numpy 1.26.0\n",
+      "[OK] matplotlib 3.8.2\n",
+      "[OK] jupyterlab 4.0.6\n",
+      "[OK] tensorflow 2.15.0\n",
+      "[OK] torch 2.2.1\n",
+      "[OK] tqdm 4.66.1\n",
+      "[OK] tiktoken 0.5.1\n"
+     ]
+    }
+   ],
+   "source": [
+    "from python_environment_check import check_packages, get_requirements_dict\n",
+    "\n",
+    "d = get_requirements_dict()\n",
+    "check_packages(d)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}