Refacto sitemanager and databasesmanager

[Roronoatii]

add comments and refacto for better lisibility

[Bilnaa]

This pull request includes several changes aimed at improving code readability and adding comments to clarify the purpose of various methods and sections of the code. The changes span multiple files, focusing on enhancing the documentation and understanding of the codebase.

Improvements to code readability and documentation:

• src/Classes/DatabasesManager.java: Added comments to explain the purpose of methods like verifyDatabase, createDatabase, and getEncryptionMap. [1] [2] [3]
• src/Classes/Menu.java: Added comments to clarify the user prompts and choices in the encryption method selection process. [1] [2]
• src/Classes/PasswordUtils.java: Added a comment to explain the random password generation process.
• src/Classes/SiteManager.java: Added comments throughout the class to explain the purpose of methods and the encryption/decryption processes. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]