docs: move Details style variants docs, add Aura style props

[web-padawan]

• Moved "Theme variants" section with all the examples to the Styling page
• Added a table with Style Properties (only supported by base styles / Aura)

[github-actions]

AI Language Review

The following changes were made in the updated version of the documentation:

1. The section on "Theme Variants" in the original file has been refactored into a new section called "Style Variants".
2. A new variant called no-padding has been introduced under the Style Variants section.
3. The structure of the Styling section has been reorganized to include introductory text and a table listing the Style Variants and supported themes.
4. Several CSS property entries specific to the Aura theme have been added towards the end of the file.

There are no issues that require improvement for the changes introduced in the new file.