Updates to Sidenav component

[GomezIvann]

Checklist

• Build process is done without errors and all tests pass in the /lib directory.
• Self-reviewed the code before submitting.
• Meets accessibility standards.
• Added/updated documentation to /website as needed.
• Added/updated tests as needed.

Description
Summary of changes in the Sidenav component:

• DxcSidenav.Link prop children has changed its type from string to React.ReactNode.
• Specs updated:
  • Removed line heights to be able to properly align text inside a Sidenav link.
  • Removed unnecessary margin-right for SVGs inside the compound component Title.
  • Removed React.Children from the implementation and using instead React Context API and other resources. In the new React documentation site, they have established React.Children as a legacy API and recommend not to use it whenever possible (https://react.dev/reference/react/Children).
• Documentation updated:
  • More logical hierarchy and improved descriptions.
  • Updated children's prop type.
  • Updated description for some props.

Closes #1587