🎉 Improve styles file weight (#5724)

This PR improves the weight of the style files by removing some css
files from the scss variable bundle.

FINAL:
![Screenshot 2024-12-11 at 11 55
33](https://github.com/user-attachments/assets/097dbd99-6d18-4109-b5ed-4a02fdabc8c5)

---------

Co-authored-by: Damián Pumar <[email protected]>

Author: leiyre

argilla-frontend/CHANGELOG.md

@@ -18,6 +18,7 @@ These are the section headers that we use:
 
 ### Fixed
 
+- Improved performance and accessibility ([#5724](https://github.com/argilla-io/argilla/pull/5724))
 - Fixed dataset update date information in the dataset list ([#5741](https://github.com/argilla-io/argilla/pull/#5741))
 
 ## [2.5.0](https://github.com/argilla-io/argilla/compare/v2.4.1...v2.5.0)

argilla-frontend/assets/scss/abstract/fonts/fonts.scss renamed to argilla-frontend/assets/css/fonts.css

@@ -16,10 +16,8 @@
  */
 
 // abstract
-@import "abstract/fonts/fonts";
 @import "abstract/functions/functions";
 @import "abstract/variables/variables";
-@import "abstract/variables/themes";
 @import "abstract/mixins/mixins";
 @import "abstract/mixins/media-queries";
 @import "abstract/mixins/grid-mixins";