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/organization/[id].vue

@@ -4,7 +4,7 @@
 	</div>
 	<div
 		v-else-if="organization"
-		class="experimental-styles-within new-page sidebar"
+		class="new-page sidebar"
 		:class="{ 'alt-layout': cosmetics.leftContentLayout || routeHasSettings }"
 	>
 		<ModalCreation ref="modal_creation" :organization-id="organization.id" />
@@ -176,14 +176,18 @@
 					<h2>Invitation to join {{ organization.name }}</h2>
 					<p>You have been invited to join {{ organization.name }}.</p>
 					<div class="input-group">
-						<button class="iconified-button brand-button" @click="onAcceptInvite">
-							<CheckIcon />
-							Accept
-						</button>
-						<button class="iconified-button danger-button" @click="onDeclineInvite">
-							<XIcon />
-							Decline
-						</button>
+						<ButtonStyled color="brand">
+							<button @click="onAcceptInvite">
+								<CheckIcon />
+								Accept
+							</button>
+						</ButtonStyled>
+						<ButtonStyled color="red">
+							<button @click="onDeclineInvite">
+								<XIcon />
+								Decline
+							</button>
+						</ButtonStyled>
 					</div>
 				</div>
 				<div v-if="navLinks.length > 2" class="mb-4 max-w-full overflow-x-auto">