docs: update README with outliner features and add curl one-liner installer

compose.yaml

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+services:
+  mindsift:
+    image: git.dsit.me/sandrodach/mindsift:dev
+    container_name: mindsift
+    restart: unless-stopped
+    ports:
+      - "${PORT:-8080}:8080"
+    volumes:
+      - ./data:/data
+    environment:
+      - PORT=8080
+      - DATA_DIR=/data
+      - JWT_SECRET=${JWT_SECRET:-change_this_to_a_secure_random_key_min_32_chars}
+      - BASE_URL=${BASE_URL:-http://localhost:8080}
+      - ALLOW_REGISTRATION=${ALLOW_REGISTRATION:-false}
+      - LOG_LEVEL=${LOG_LEVEL:-info}
+      # Optional SMTP / Mail Configuration (can also be configured in Admin UI)
+      - SMTP_HOST=${SMTP_HOST:-}
+      - SMTP_PORT=${SMTP_PORT:-587}
+      - SMTP_USER=${SMTP_USER:-}
+      - SMTP_PASS=${SMTP_PASS:-}
+      - SMTP_FROM=${SMTP_FROM:-}
+      - SMTP_TLS=${SMTP_TLS:-true}