more ui enhancements

new in this commit:
- rounded corners everywhere! cobalt is now safe for everyone who can't handle sharp objects.
- proper banner loading. no more jumping text!
- proper banner error handling. if banner wasn't loaded, it'll simply go grey instead of disappearing.
- links are no longer italic and are instead underlined.
- collapsible lists now have corresponding emoji.
- donate button is now highlighted with magenta instead of white.
- added a list of keyboard shortcuts to about tab.
- centered old changelog loader.

src/modules/emoji.js

@@ -26,7 +26,12 @@ const names = {
     "👾": "alien_monster",
     "😿": "cat_crying",
     "🙀": "cat_flabbergasted",
-    "🐱": "cat_smile"
+    "🐱": "cat_smile",
+    "❤️‍🩹": "mending_heart",
+    "🔒": "locked",
+    "🔍": "magnifying_glass",
+    "🔗": "link",
+    "⌨": "keyboard"
 }
 let sizing = {
     18: 0.8,