chore: clean up a bunch of legacy styles (#5973)

* remove unused experimental-styles-within

* remove unused styles

* more cleanup + prepr

* Refactor nearly all legacy buttons to use ButtonStyled

* prepr

* Update MC account selector to modern version

* prepr

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Co-authored-by: Calum H. <calum@modrinth.com>

packages/ui/src/components/base/OptionGroup.vue

@@ -1,7 +1,7 @@
 <template>
 	<nav
 		ref="scrollContainer"
-		class="card-shadow experimental-styles-within relative flex w-fit overflow-x-auto rounded-full bg-bg-raised p-1 text-sm font-bold"
+		class="card-shadow relative flex w-fit overflow-x-auto rounded-full bg-bg-raised p-1 text-sm font-bold"
 	>
 		<button
 			v-for="(option, index) in options"