Add Table of CLI Flags, Environment Variables, and Descriptions to Getting Started Guide

[mastercactapus]

What problem would you like to solve? Please describe:
Currently, the Getting Started guide for GoAlert does not include a comprehensive table that lists all the command line flags, corresponding environment variables, and descriptions for the project.

Describe the solution you'd like:
I propose adding a table to the Getting Started guide, which includes:

1. All available command line flags
2. Corresponding environment variables for each flag
3. Clear and concise descriptions for each flag and variable

This table will make it easier for new users to understand and utilize GoAlert's configurable options and help new users get started quickly and efficiently.

Additional context:
This feature request aims to improve the documentation and user experience for new users of the GoAlert project.