chore(ci): remove drone configuration

.drone.yml

@@ -1,97 +0,0 @@
----
-kind: pipeline
-type: kubernetes
-name: linter
-
-clone:
-  disable: true
-
-steps:
-- name: clone
-  image: git.cryptic.systems/volker.raschek/git:1.4.0
-
-- name: markdown lint
-  commands:
-  - markdownlint *.md
-  image: git.cryptic.systems/volker.raschek/markdownlint:0.44.0
-  resources:
-    limits:
-      cpu: 150
-      memory: 150M
-
-- name: email-notification
-  environment:
-    SMTP_FROM_ADDRESS:
-      from_secret: smtp_from_address
-    SMTP_FROM_NAME:
-      from_secret: smtp_from_name
-    SMTP_HOST:
-      from_secret: smtp_host
-    SMTP_USERNAME:
-      from_secret: smtp_username
-    SMTP_PASSWORD:
-      from_secret: smtp_password
-  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
-  resources:
-    limits:
-      cpu: 150
-      memory: 150M
-  when:
-    status:
-    - changed
-    - failure
-
-trigger:
-  event:
-    exclude:
-    - tag
-
----
-kind: pipeline
-type: kubernetes
-name: sync-to-aur.archlinux.org
-
-clone:
-  disable: true
-
-steps:
-- name: clone
-  image: git.cryptic.systems/volker.raschek/git:1.4.0
-
-- name: git-push
-  image: docker.io/appleboy/drone-git-push:1.1.1
-  settings:
-    branch: master
-    remote: ssh://aur@aur.archlinux.org/postfix-policyd-spf-perl.git
-    force: false
-    commit: false
-    ssh_key:
-      from_secret: aur_ssh_key
-
-- name: email-notification
-  environment:
-    SMTP_FROM_ADDRESS:
-      from_secret: smtp_from_address
-    SMTP_FROM_NAME:
-      from_secret: smtp_from_name
-    SMTP_HOST:
-      from_secret: smtp_host
-    SMTP_USERNAME:
-      from_secret: smtp_username
-    SMTP_PASSWORD:
-      from_secret: smtp_password
-  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
-  resources:
-    limits:
-      cpu: 150
-      memory: 150M
-  when:
-    status:
-    - changed
-    - failure
-
-trigger:
-  event:
-  - tag
-  repo:
-  - volker.raschek/postfix-policyd-spf-perl-pkg

README.md

@@ -1,7 +1,6 @@
 # postfix-policyd-spf-perl
 
 ![AUR version](https://img.shields.io/aur/version/postfix-policyd-spf-perl?label=AUR)
-[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/postfix-policyd-spf-perl-pkg/status.svg)](https://drone.cryptic.systems/volker.raschek/postfix-policyd-spf-perl-pkg)
 ![AUR votes](https://img.shields.io/aur/votes/postfix-policyd-spf-perl)
 
 This repository contains build files to build the Arch Linux package `postfix-policyd-spf-perl`. Instead of building the