Refactor calculator.ipynb to improve Colab integration and update installation command

Removed unnecessary newline in the Colab badge section and changed the installation command from `!pip` to `%pip` for better compatibility in Jupyter environments.

Author: FridrichMethod

README.md

@@ -1,6 +1,6 @@
 # Uncertainty Calculator
 
-[![Python 3.12+](https://img.shields.io/badge/Python-3.12+-blue.svg?logo=python&logoColor=white)](https://www.python.org/downloads/release/python-3120/) [![CI Status](https://github.com/fridrichmethod/UncertaintyCalculator/workflows/CI/badge.svg)](https://github.com/fridrichmethod/UncertaintyCalculator/actions) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/FridrichMethod/UncertaintyCalculator/blob/main/calculator.ipynb)
+[![Python 3.12+](https://img.shields.io/badge/Python-3.12+-blue.svg?logo=python&logoColor=white)](https://www.python.org/downloads/release/python-3120/) [![CI Status](https://github.com/fridrichmethod/UncertaintyCalculator/workflows/CI/badge.svg)](https://github.com/fridrichmethod/UncertaintyCalculator/actions) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Open in Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/FridrichMethod/UncertaintyCalculator/blob/main/calculator.ipynb)
 
 A Python tool for automated error propagation in physical experiments. This calculator uses symbolic differentiation to compute partial derivatives and propagate uncertainties, generating detailed LaTeX output for your reports.
 

calculator.ipynb

@@ -5,8 +5,14 @@
    "id": "a34b649d",
    "metadata": {},
    "source": [
-    "<a href=\"https://colab.research.google.com/github/FridrichMethod/UncertaintyCalculator/blob/main/calculator.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>\n",
-    "\n",
+    "<a href=\"https://colab.research.google.com/github/FridrichMethod/UncertaintyCalculator/blob/main/calculator.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "e56cf1ba",
+   "metadata": {},
+   "source": [
     "# Uncertainty Calculator\n",
     "\n",
     "> Copyright <https://github.com/FridrichMethod>."
@@ -20,7 +26,7 @@
    "outputs": [],
    "source": [
     "# Install the package from GitHub\n",
-    "!pip install git+https://github.com/FridrichMethod/UncertaintyCalculator.git"
+    "%pip install git+https://github.com/FridrichMethod/UncertaintyCalculator.git"
    ]
   },
   {