Refactor deployment process to use prebuilt Docker images

Replaced local builds with prebuilt backend and frontend Docker images for simplified deployment. Updated documentation and Makefile to reflect the changes and added a bootstrap script for quick setup of deployment files. Removed deprecated `VITE_API_URL` variable and references to streamline the setup.

ops/scripts/bootstrap-compose.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Usage:
+#   bash bootstrap-compose.sh
+#   BASE_URL="https://git.nesterovic.cc/nessi/NexaPG/raw/branch/main" bash bootstrap-compose.sh
+
+BASE_URL="${BASE_URL:-https://git.nesterovic.cc/nessi/NexaPG/raw/branch/main}"
+
+echo "[bootstrap] Using base URL: ${BASE_URL}"
+
+fetch_file() {
+  local path="$1"
+  local out="$2"
+
+  if command -v wget >/dev/null 2>&1; then
+    wget -q -O "${out}" "${BASE_URL}/${path}"
+  elif command -v curl >/dev/null 2>&1; then
+    curl -fsSL "${BASE_URL}/${path}" -o "${out}"
+  else
+    echo "[bootstrap] ERROR: wget or curl is required"
+    exit 1
+  fi
+}
+
+fetch_file "docker-compose.yml" "docker-compose.yml"
+fetch_file ".env.example" ".env.example"
+fetch_file "Makefile" "Makefile"
+
+if [[ ! -f ".env" ]]; then
+  cp .env.example .env
+  echo "[bootstrap] Created .env from .env.example"
+else
+  echo "[bootstrap] .env already exists, keeping it"
+fi
+
+echo
+echo "[bootstrap] Next steps:"
+echo "  1) Edit .env (set JWT_SECRET_KEY and ENCRYPTION_KEY at minimum)"
+echo "  2) Run: make up"
+echo