Update README.md

Author: jedwin3210

README.md

@@ -3,18 +3,28 @@ Online JupyterBook for learning Linear Algebra
 
 ## Getting Started with Jupyterbook
 
-# 1. Install CLI (if not already)
-pip install "jupyter-book>=2.0.0"
+1. **Install CLI (if not already):**
+   ```bash
+   pip install "jupyter-book>=2.0.0"
+   ```
 
-# 2. Create myst.yml
-jupyter book init
+2. **Create `myst.yml`:**
+   ```bash
+   jupyter book init
+   ```
 
-# 3. Add content (manually create files like intro.md, chapters/*.md, or .ipynb)
-#    Then generate TOC:
-jupyter book init --write-toc
+3. **Add content** (manually create files like `intro.md`, `chapters/*.md`, or `.ipynb`).
 
-# 4. Preview locally
-jupyter book start
+   ```bash
+   jupyter book init --write-toc
+   ```
 
-# 5. Add GitHub Pages CI
-jupyter book init --gh-pages
+4. **Preview locally:**
+   ```bash
+   jupyter book start
+   ```
+
+5. **Add GitHub Pages CI:**
+   ```bash
+   jupyter book init --gh-pages
+   ```