Remove CSS modules (#6017)

CSS modules were used as a first test for performance optimization.

We later found out that Linaria was a better tradeoff.

This PR removes what was implemented in CSS modules and also the CSS
theme file that was created that was overlapping with the TS theme
files.

packages/twenty-ui/src/theme/constants/BorderCommon.ts

@@ -1,7 +1,7 @@
 export const BORDER_COMMON = {
   radius: {
     xs: '2px',
-    sm: 'var(--twentycrm-border-radius-sm)',
+    sm: '4px',
     md: '8px',
     xl: '20px',
     pill: '999px',

packages/twenty-ui/src/theme/constants/FontCommon.ts

@@ -10,7 +10,7 @@ export const FONT_COMMON = {
   },
   weight: {
     regular: 400,
-    medium: 'var(--twentycrm-font-weight-medium)',
+    medium: 500,
     semiBold: 600,
   },
   family: 'Inter, sans-serif',