Remove stephpy/vim-yaml syntax

It causes issues:
- https://github.com/dracula/vim/pull/163
- https://github.com/stephpy/vim-yaml/issues/22

packages.yaml

@@ -1661,11 +1661,6 @@ filetypes:
   - fish_read_history
   ignored_filenames:
   - '~/.config/fish/fish_{read_,}history'
----
-name: yaml-extras
-remote: stephpy/vim-yaml
-after: yaml
-filetypes: []
 # Ansible needs to be after YAML
 ---
 name: ansible