Update themes.yml

Signed-off-by: Nathan Sparrow <[email protected]>

config/themes.yml

@@ -1,4 +1,9 @@
 default: styles/application.scss
 contrast: styles/contrast.scss
 mastodon-light: styles/mastodon-light.scss
+tangerineui: styles/tangerineui.scss
+tangerineui-purple: styles/tangerineui-purple.scss
+tangerineui-cherry: styles/tangerineui-cherry.scss
+tangerineui-peach: styles/tangerineui-peach.scss
+tangerineui-lemon: styles/tangerineui-lemon.scss