refactor: remove unused files

.drone.yml

@@ -1,20 +0,0 @@
----
-kind: pipeline
-type: exec
-name: default
-platform:
-  os: linux
-  arch: amd64
-clone:
-  disable: true
-steps:
-- name: download
-  commands:
-  - cd /opt/www/htdocs/os && wget https://github.com/lxsang/antos/raw/1.2.1/release/antos-1.2.1.tar.gz
-- name: build
-  commands:
-  - cd /opt/www/htdocs/os && tar xvzf antos-1.2.1.tar.gz
-  - rm /opt/www/htdocs/os/antos-1.2.1.tar.gz
-trigger:
-  branch:
-  - 1.2.1