refactor: migrate theme from dark-mode obsidian to light-mode indigo palette

web/tailwind.config.cjs

@@ -7,26 +7,13 @@ module.exports = {
     extend: {
       colors: {
         amber: colors.amber,
-        slate: colors.zinc,
-        indigo: {
-          50: '#f0f9ff',
-          100: '#e0f2fe',
-          200: '#bae6fd',
-          300: '#7dd3fc',
-          400: '#38bdf8',
-          500: '#0ea5e9',
-          600: '#0284c7',
-          700: '#0369a1',
-          800: '#075985',
-          900: '#0c4a6e',
-          950: '#082f49',
-        }, // Overriding indigo with a sharp Cyan/Sky Blue palette
+        slate: colors.slate,
+        indigo: colors.indigo,
         violet: colors.violet,
         emerald: colors.emerald,
-        zinc: colors.zinc,
       },
       fontFamily: {
-        sans: ['Outfit', 'Inter', 'system-ui', 'sans-serif'],
+        sans: ['Inter', 'system-ui', 'sans-serif'],
       },
     },
   },