Finalize theme support

src/routes/preferences.nim

@@ -1,4 +1,4 @@
-import strutils, uri, os
+import strutils, uri, os, algorithm
 
 import jester
 
@@ -11,6 +11,7 @@ export preferences
 proc findThemes*(dir: string): seq[string] =
   for kind, path in walkDir(dir / "css" / "themes"):
     result.add path.splitFile.name.capitalizeAscii
+  reverse(result)
 
 proc createPrefRouter*(cfg: Config) =
   router preferences: