Graphical overhaul.

Remove all legacy pixeldrain pages, handlers and assets.
Remove old theming engine.
Make logo responsive to the accent colour.
Lots of other stuff.

svelte/src/filesystem/Filesystem.svelte

@@ -8,6 +8,7 @@ import FilePreview from "./viewers/FilePreview.svelte";
 import FSUploadWidget from "./upload_widget/FSUploadWidget.svelte";
 import { global_navigator } from "./FSNavigator"
 import { css_from_path } from "filesystem/edit_window/Branding";
+import { update_favicon } from "util/NovaLogo.svelte";
 import AffiliatePrompt from "user_home/AffiliatePrompt.svelte";
 import { current_page_store } from "wrap/RouterStore";
 import SearchBar from "./SearchBar.svelte";
@@ -46,11 +47,13 @@ onMount(() => {
 		// styles take precedence since they're lower level, and we can clean it
 		// up afterwards without overwriting global style
 		document.body.style = css_from_path(nav.path)
+		update_favicon()
 	})
 	return () => {
 		page_sub()
 		nav_sub()
 		document.body.style = ""
+		update_favicon()
 	}
 })