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/admin/docs.vue

@@ -96,8 +96,8 @@ onMounted(() => {
 						</div>
 
 						<div class="mt-auto flex gap-2">
-							<ButtonStyled color="brand" class="flex-1">
-								<button class="w-full justify-center" @click="openPreview(id)">
+							<ButtonStyled color="brand">
+								<button class="w-full flex-1 justify-center" @click="openPreview(id)">
 									<PlayIcon class="h-4 w-4" aria-hidden="true" />
 									Preview
 								</button>