Add FAQ Section to Documentation

[hardiktheprogrammer]

Description

Enhance the user experience and provide additional support by incorporating a Frequently Asked Questions (FAQ) section into the documentation. This section will serve as a valuable resource for users, addressing common queries and concerns. Please contribute your insights and frequently encountered questions to help create a comprehensive and user-friendly FAQ that enhances the usability of the documentation. Let's collaborate to make the documentation more accessible and informative for everyone. -->

[hardiktheprogrammer]

Hi Sigstore Team I would like to work on this issue I have a good understanding of writing documentation @mdunbavan @stefan-zh