🎨 Made color switcher change Mantine styles

Moved the color switcher's functions to a context provider and made Mantine's styles derived off of that context.

src/components/Settings/AdvancedSettings.tsx

@@ -44,9 +44,7 @@ export default function TitleChanger() {
             {...form.getInputProps('favicon')}
           />
           <TextInput label="Background" placeholder="" {...form.getInputProps('background')} />
-          <Button type="submit" color={config.settings.primaryColor || 'red'}>
-            Save
-          </Button>
+          <Button type="submit">Save</Button>
         </Group>
       </form>
     </Group>