[documentation] Creates Docker documentation and docker-compose.yaml (#416)

* exludes docker-volume from exemple/docker-compose

* Adds an docker-compose.yaml example and adds some readme to the
docker.md

* Changes Docker-Compose Example

* Configures docker-compose.yaml and docker.md

* Adds some cosmetics to the Documentation

* Adds UserID:GroupID

* Describes how to create a new user

example/docker-compose/docker-compose.yaml

@@ -0,0 +1,34 @@
+version: "3.3"
+
+services:
+  gotosocial:
+    image: superseriousbusiness/gotosocial:0.2.0
+    user: "1000:1000"
+    networks:
+      - gotosocial
+    ports:
+     - "127.0.0.1:8080:8080"
+    volumes:
+      - ./docker-volumes/data:/gotosocial/storage
+      - ./config.yaml:/config/config.yaml
+    command: ["--config-path", "/config/config.yaml"]
+    depends_on:
+      - gotosocial_postgres
+    restart: "always"
+
+  gotosocial_postgres:
+    image: postgres:14-alpine
+    environment:
+      POSTGRES_DB: gotosocial
+      POSTGRES_USER: gotosocial
+      POSTGRES_PASSWORD: # Create a Password for example with "openssl rand -hex 16"
+    volumes:
+      - ./docker-volumes/db:/var/lib/postgresql/data
+    restart: "always"
+    networks:
+      - gotosocial
+
+networks:
+  gotosocial:
+    ipam:
+      driver: default