fix(css-variables): add root selector without classname

[iManu]

Summary

Need to add the :root in addition to :root.classname for some use cases, when we do not need to add the class in html tag for sites that does not have multiple themes

Type

• Enhancement

Summarise concisely:

• add simple :root selector on generated css

What is expected?

• It should enable usage of css variable without the need of adding the classname to html tag

The following changes where made:

(Describe what you did)

1. update create-css-variables.tsx

[changeset-bot]

🦋 Changeset detected

Latest commit: 797f697

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@ultraviolet/themes	Minor
@ultraviolet/form	Patch
@ultraviolet/icons	Patch
@ultraviolet/illustrations	Patch
@ultraviolet/plus	Patch
@ultraviolet/ui	Patch
@ultraviolet/nextjs	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.48%. Comparing base (59dd42c) to head (797f697).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5513   +/-   ##
=======================================
  Coverage   92.48%   92.48%           
=======================================
  Files         228      228           
  Lines        8131     8131           
  Branches     3509     3560   +51     
=======================================
  Hits         7520     7520           
  Misses        611      611           

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