Updated colors for neutral light palette

[bhaveshraja]

Primitive palette
--neutral-white: oklch(1 0 0);
    --neutral-100: oklch(0.9911 0 0);
    --neutral-200: oklch(0.9821 0 0);
    --neutral-300: oklch(0.9614 0.0013 286.38);
    --neutral-400: oklch(0.9396 0.0017 247.84);
    --neutral-500: oklch(0.9123 0.0017 247.84);
    --neutral-600: oklch(0.8782 0.0035 247.86);
    --neutral-700: oklch(0.8466 0.0043 236.51);
    --neutral-800: oklch(0.5651 0.0086 228.95);
    --neutral-900: oklch(0.4928 0.0079 233.77);
    --neutral-1000: oklch(0.4176 0.0072 239.98);
    --neutral-1100: oklch(0.3225 0.0045 219.62);
    --neutral-1200: oklch(0.1689 0.0021 286.18);
    --neutral-black: oklch(0.1149 0 0);

Semantic mapping changes
--txt-placeholder: var(--neutral-900);
  --txt-disabled: var(--neutral-800);

[lifeiscontent]

done in #214