docs: new styling docs / stylesheets

[sissbruecker]

Adds the Stylesheets article for the new styling docs.

Note

The PR targets a base branch for the new styling docs. That branch has the old styling docs removed and new articles are added gradually until the new section is ready. Cross-references between new articles will be filled in later, respective sections have been marked with TODOs.

[github-actions]

AI Language Review

The following issues need improvement in the document titled "Stylesheets":

1. Inconsistent Use of Quotation Marks: Ensure consistent use of quotation marks. For example, in the sentence "you can link:..." there is inconsistent usage or lack thereof around links.

2. Incorrect Syntax Citation: The sentence "You can link:https://developer.mozilla.org/en-US/docs/Web/CSS/@import[read more about the @import at-rule on on MDN]" has a formatting issue. It should follow proper Asciidoc link formatting.

3. Section Heading Mistake: The section titled ".CSS Class Names" should be formatted as a proper section or subsection heading and not just start with a period. Additionally, consider changing "[NOTE]" to adhere to Asciidoc conventions or styles used elsewhere in the document.

4. Missing Links in TODO Comments: Address the TODO comment by either removing it if not needed or providing the correct link. The TODO reads: "// TODO: Link "CSS classnames" to where?" and "// TODO Link "loaded and unloaded dynamically" to Dynamic Loading article."

These improvements can enhance clarity and maintain consistency and professionalism in the documentation.