Fixes a build warning about missing .svelte-kit/tsconfig.json that
appears when building inside Docker. Running npx svelte-kit sync
pre-generates the required SvelteKit scaffolding before the main
build step.
Also update README title to reflect Svelte v5 and trim a trailing
whitespace in the environment handling section.
- Replaced manual rsync/npm_deploy workflow with multi-stage Docker builds.
- Added Dockerfile and .dockerignore for staging and production environments.
- Added 'deploy:staging' and 'deploy:prod' scripts to package.json.
- Updated README.md with new deployment instructions.