Add support for proxy networks & cleanup playbook vars

roles/neovim/tasks/Debian.yaml

@@ -79,6 +79,7 @@
   get_url:
     url: '{{asset[0].browser_download_url}}'
     dest: '{{package_path}}'
+  environment: '{{proxy_environment}}'
 
 - name: extract package archive
   when: install_required