Add deploy tooling, docs, and Aspire config

deploy/.env.example

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+# Copy this file to .env and fill in production values before deploying.
+
+# Registry login used by deploy/push-images.ps1.
+REGISTRY_ENDPOINT=git.recroomarchive.org
+REGISTRY_REPOSITORY=recroomarchive-deploy/tenwholeyears-server
+REGISTRY_USERNAME=replace-with-registry-username
+REGISTRY_TOKEN=replace-with-registry-token
+IMAGE_TAG=latest
+
+# Database.
+POSTGRES_PASSWORD=replace-with-long-random-postgres-password
+
+# API configuration.
+Jwt__Secret=replace-with-at-least-32-random-characters
+Jwt__Issuer=https://your-api.example.com
+Jwt__Audience=TenWholeYears
+Jwt__ExpiryMinutes=60
+Steam__ApiKey=replace-with-steam-web-api-key
+Steam__AppId=480
+Neutrino__ValidateSecret=true
+Neutrino__Secret=replace-with-neutrino-secret
+RecNet__UseForwardedHeaders=true