6.0

in this commit:
- enhanced css (hover border, less annoying donate highlight, checkbox width fix for mobile, more consistent color scheme)
- addition of an urgent notice (in this case it mentions all issues related to old infra being fixed)
- updated twitter picker test
- changelog for 6.0
- removed partial translations

package.json

@@ -1,7 +1,7 @@
 {
     "name": "cobalt",
     "description": "save what you love",
-    "version": "6.0-dev",
+    "version": "6.0",
     "author": "wukko",
     "exports": "./src/cobalt.js",
     "type": "module",