Unified theme for all Sign in buttons

Um, so I made all the Sign in buttons look the same now - same like styling and functiounality across all of them.
Also, the button that used to send people to /login (which doesn’t even exist .-. ) now opens the sign-in popup instead.
Did the same for the one on the coinSymbol page so no more redirect to "/", it just opens the popup now.
Oh, and the comments section button also opens the Popup. Just annoyed me that they looked differently and redirected to 404 Pages.

website/src/lib/components/self/CommentSection.svelte

@@ -219,7 +219,7 @@
 		{:else}
 			<div class="text-center">
 				<p class="text-muted-foreground mb-3 text-sm">Sign in to join the discussion</p>
-				<Button onclick={() => goto('/')} size="sm">Sign In</Button>
+				<Button onclick={() => (shouldSignIn = true)} size="sm">Sign In</Button>
 			</div>
 		{/if}