Docker (#2867)

* Dockerize Misskey

* Add a new line at EOF

* Add support Elasticsearch

* /

* Add setup document for docker

* Add english document

* Edit docs

* docker -> Docker

* Arrange format

* Update docker.en.md

* Modify title

.dockerignore

@@ -0,0 +1,12 @@
+.autogen
+.git
+.github
+.travis
+.vscode
+Dockerfile
+build/
+docker-compose.yml
+node_modules/
+mongo/
+redis/
+elasticsearch/