Integrate drone and automate process (#11)

* Drop upstream docs
* Drop gitlab-ci config
* Replace empty readme
* Preview listening on 0.0.0.0
* Use correct AGPL-3.0 license
* Reorder gitignore
* Clean and reorder package.json
* Update yarn lockfile
* Integrate drone automation

Author: tboerger

.drone.yml

@@ -0,0 +1,92 @@
+workspace:
+  base: /drone
+  path: src
+
+branches:
+  - master
+
+clone:
+  git:
+    image: plugins/git:next
+    pull: true
+
+pipeline:
+  cache-restore:
+    image: plugins/s3-cache:1
+    pull: true
+    secrets: [ cache_s3_endpoint, cache_s3_access_key, cache_s3_secret_key ]
+    restore: true
+    when:
+      local: false
+
+  frontend-deps:
+    image: webhippie/nodejs:latest
+    pull: true
+    commands:
+      - yarn install
+
+  frontend-lint:
+    image: webhippie/nodejs:latest
+    pull: true
+    commands:
+      - gulp lint
+
+  frontend-build:
+    image: webhippie/nodejs:latest
+    pull: true
+    commands:
+      - gulp pack
+
+  cache-rebuild:
+    image: plugins/s3-cache:1
+    pull: true
+    secrets: [ cache_s3_endpoint, cache_s3_access_key, cache_s3_secret_key ]
+    rebuild: true
+    mount:
+      - node_modules
+    when:
+      local: false
+      event: [ push ]
+
+  cache-flush:
+    image: plugins/s3-cache:1
+    pull: true
+    secrets: [ cache_s3_endpoint, cache_s3_access_key, cache_s3_secret_key ]
+    flush: true
+    flush_age: 14
+    when:
+      local: false
+      event: [ push ]
+
+  upload-artifact:
+    image: plugins/s3:1
+    pull: true
+    secrets: [ aws_access_key_id, aws_secret_access_key ]
+    bucket: documentation
+    endpoint: https://minio.owncloud.com
+    path_style: true
+    strip_prefix: build/
+    source: build/ui-bundle.zip
+    target: /
+    when:
+      local: false
+      event: [ push ]
+
+  github-release:
+    image: plugins/github-release:1
+    pull: true
+    secrets: [ github_token ]
+    files:
+      - build/ui-bundle.zip
+    when:
+      local: false
+      event: [ tag ]
+
+  notify-slack:
+    image: plugins/slack
+    secrets: [ slack_webhook ]
+    channel: documentation
+    when:
+      local: false
+      event: [ push, tag ]
+      status: [ success, failure ]

.gitignore

@@ -1,3 +1,4 @@
 /build/
-/node_modules/
 /public/
+
+/node_modules/