feat: user wallets

[bl0up]

Summary by Sourcery

Introduce the User Wallets feature to enable efficient management of multiple wallets with enhanced privacy and performance. Update documentation to include setup and usage instructions for the new feature.

New Features:

• Introduce a User Wallets feature that allows for efficient and scalable management of multiple wallets, enhancing privacy and performance.

Documentation:

• Add documentation for the new User Wallets feature, including setup and creation instructions.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR introduces a new user wallets feature documentation while removing an old authentication document. The changes primarily focus on documenting the user wallets functionality, including setup instructions, wallet creation process, and management capabilities.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added comprehensive documentation for the User Wallets feature	Added overview of User Wallets feature highlighting benefits like infinite wallet management and cost-effectiveness Included step-by-step setup instructions for creating user wallets Added instructions for wallet creation and management Included information about wallet funding requirements for gas fees	docs/using-platform/18_user_wallet.md
Updated supported blockchain networks list	Added Binance Smart Chain to the list of supported public chains	docs/launch-platform/self-hosted/installing-on-an-existing-cluster/introduction.md
Removed legacy authentication documentation	Removed the old authentication documentation file	docs/using-platform/18_authentication.md

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