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

---------

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

apps/frontend/src/pages/news/article/[slug].vue

@@ -108,7 +108,7 @@ onMounted(() => {
 </script>
 
 <template>
-	<div class="page experimental-styles-within py-6">
+	<div class="page py-6">
 		<div
 			class="flex flex-wrap items-center justify-between gap-4 border-0 border-b-[1px] border-solid border-divider px-6 pb-6"
 		>
@@ -122,7 +122,7 @@ onMounted(() => {
 						<RssIcon />
 					</a>
 				</ButtonStyled>
-				<ButtonStyled circular icon-only>
+				<ButtonStyled circular>
 					<a v-tooltip="`Changelog`" href="/news/changelog" aria-label="Changelog">
 						<GitGraphIcon />
 					</a>