build(homebrew): rename cask directory

- Update GoReleaser config
- Move generated cask files to Casks/
- Improve consistency in output structure

Author: programmersd21

.goreleaser.yaml

@@ -78,7 +78,7 @@ homebrew_casks:
       owner: programmersd21
       name: kairo
 
-    directory: HomebrewCask
+    directory: Casks
 
     commit_msg_template: "Brew cask update for {{ .ProjectName }} {{ .Tag }}"