refact!: prepare for transfer

apply @sgoudham's suggestions
ref https://github.com/catppuccin/catppuccin/issues/2696#issuecomment-2707252468

changes:
- removed every styling outside of the colors themselves (i.e. rounding,
  `text-shadow` & `padding`)
- changed the default accent color to `mauve`
- renamed flavour CSS filenames from `<f>.css` to `catppuccin-<f>.css`

Signed-off-by: Adam Perkowski <adas1per@protonmail.com>

themes/catppuccin-mocha.css

@@ -0,0 +1,25 @@
+:root {
+  --rosewater: #f5e0dc;
+  --flamingo: #f2cdcd;
+  --pink: #f5c2e7;
+  --mauve: #cba6f7;
+  --red: #f38ba8;
+  --maroon: #eba0ac;
+  --peach: #fab387;
+  --yellow: #f9e2af;
+  --green: #a6e3a1;
+  --teal: #94e2d5;
+  --sky: #89dceb;
+  --sapphire: #74c7ec;
+  --blue: #89b4fa;
+  --lavender: #b4befe;
+
+  --main-color: var(--mauve);
+  --main-background: #1e1e2e;
+  --second-background: #181825;
+  --hover-background: #313244;
+  --main-text: #cdd6f4;
+  --dimmer-text: #9399b2;
+  --green-color: var(--green);
+  --red-color: var(--red);
+}