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/03_optional-docker-environment/.devcontainer/Dockerfile

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+FROM pytorch/pytorch:2.0.1-cuda11.7-cudnn8-runtime
+
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install -y rsync && \
+    apt-get install -y git && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt requirements.txt
+
+RUN pip install --no-cache-dir -r requirements.txt

setup/03_optional-docker-environment/.devcontainer/README.md

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+# Optional Docker Environment
+
+This is an optional Docker environment for those users who prefer Docker. In case you are interested in using this Docker DevContainer, please see the *Using Docker DevContainers* section in the [../../README.md](../../README.md) for more information.

setup/03_optional-docker-environment/.devcontainer/devcontainer.json

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+{
+  "name": "LLMs From Scratch",
+  "build": {
+    "context": "..",
+    "dockerfile": "Dockerfile"
+  },
+  "runArgs": ["--runtime=nvidia", "--gpus=all"],
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-python.python",
+        "ms-azuretools.vscode-docker",
+        "ms-toolsai.jupyter",
+        "yahyabatulu.vscode-markdown-alert",
+        "tomoki1207.pdf"
+      ]
+    }
+  }
+}