docs: restructure documentation

This rewrite follows the principles of https://diataxis.fr/

Co-authored-by: Erik Michelson <github@erik.michelson.eu>
Signed-off-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Erik Michelson <github@erik.michelson.eu>

docs/content/files/setup-docker/Caddyfile

@@ -0,0 +1,14 @@
+{$HD_BASE_URL}
+
+log {
+	output stdout
+	level WARN
+	format console
+}
+
+reverse_proxy /realtime http://backend:3000
+reverse_proxy /api/* http://backend:3000
+reverse_proxy /public/* http://backend:3000
+reverse_proxy /uploads/* http://backend:3000
+reverse_proxy /apidoc/* http://backend:3000
+reverse_proxy /* http://frontend:3001

docs/content/files/setup-docker/config.env

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+# General settings
+HD_BASE_URL="https://md.example.com"
+HD_SESSION_SECRET="change_me_in_production"
+
+# Database settings
+HD_DATABASE_TYPE="postgres"
+HD_DATABASE_HOST="db"
+HD_DATABASE_PORT="5432"
+HD_DATABASE_NAME="hedgedoc"
+HD_DATABASE_USER="hedgedoc"
+HD_DATABASE_PASS="password"
+
+# Uploads
+HD_MEDIA_BACKEND="filesystem"
+HD_MEDIA_BACKEND_FILESYSTEM_UPLOAD_PATH="uploads/"
+
+# Auth
+HD_AUTH_LOCAL_ENABLE_LOGIN="true"
+HD_AUTH_LOCAL_ENABLE_REGISTER="true"

docs/content/files/setup-docker/docker-compose.yml

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+services:
+  backend:
+    image: ghcr.io/hedgedoc/hedgedoc/backend:2.0-alpha
+    volumes:
+      - $PWD/.env:/usr/src/app/backend/.env
+      - hedgedoc_uploads:/usr/src/app/backend/uploads
+
+  frontend:
+    image: ghcr.io/hedgedoc/hedgedoc/frontend:2.0-alpha
+    environment:
+      HD_BASE_URL: "${HD_BASE_URL}"
+
+  db:
+    image: postgres:15
+    environment:
+      POSTGRES_USER: "${HD_DATABASE_USER}"
+      POSTGRES_PASSWORD: "${HD_DATABASE_PASS}"
+      POSTGRES_DB: "${HD_DATABASE_NAME}"
+    volumes:
+      - hedgedoc_postgres:/var/lib/postgresql/data
+
+  proxy:
+    image: caddy:latest
+    restart: unless-stopped
+    environment:
+      HD_BASE_URL: "${HD_BASE_URL}"
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp"
+    volumes:
+      - $PWD/Caddyfile:/etc/caddy/Caddyfile
+      - caddy_data:/data
+
+volumes:
+  caddy_data:
+  hedgedoc_uploads:
+  hedgedoc_postgres: