case 4727 - remove the unused Docker option

dist/docker (a runtime dockerfile and a compose file that published
PostgreSQL with a fixed password) was from early development and never
offered. Removed with its commented-out lines in build-release.bat and
the BUILD.md mention; the build-environment Dockerfiles for the docs and
the client stay. F38 (4727 step 7, the last step).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dist/docker/linux-x64/ayanovadocker/dockerfile

@@ -1,15 +0,0 @@
-FROM mcr.microsoft.com/dotnet/aspnet:6.0-alpine
-WORKDIR /app
-COPY ./files .
-RUN apk add libgdiplus --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing/
-RUN apk add postgresql-client
-RUN apk add --no-cache \
-      chromium \
-      nss \
-      freetype \
-      freetype-dev \
-      harfbuzz \
-      ca-certificates \
-      ttf-freefont
-      
-ENTRYPOINT ["dotnet", "AyaNova.dll"]

dist/docker/linux-x64/docker-compose.yml

@@ -1,44 +0,0 @@
-version: '2'
-
-services:
-
-    
-  postgresserver:
-     image: postgres:alpine
-     restart: always
-     ports:
-       - 5432:5432
-     environment:
-         POSTGRES_PASSWORD: letmein
-     volumes:
-       - /var/lib/ayanova/db:/var/lib/postgresql/data
-
-  ayanova:
-     image: gztw/ayanova:v8.0.0
-     init: true
-     restart: always
-     ports:
-       - 7575:7575
-     volumes:
-       - /var/lib:/var/lib
-     environment:
-        AYANOVA_USE_URLS: http://*:7575
-        AYANOVA_DB_CONNECTION: User ID=postgres;Password=letmein;Host=postgresserver;Port=5432;Database=AyaNova;Pooling=true;CommandTimeout=90;  
-        AYANOVA_ATTACHMENT_FILES_PATH: /var/lib/ayanova/files/user    
-        AYANOVA_BACKUP_FILES_PATH: /var/lib/ayanova/files/backup
-        AYANOVA_TEMP_FILES_PATH: /var/lib/ayanova/files/temp
-        AYANOVA_LOG_PATH: /var/lib/ayanova
-        AYANOVA_LOG_LEVEL: Info
-        AYANOVA_REPORT_RENDER_BROWSER_PATH: /usr/bin/chromium-browser
-     build:
-       context: ./ayanovadocker
-       dockerfile: Dockerfile
-     links:
-       - postgresserver
-     depends_on:
-       - "postgresserver"
-
-networks:
-  default:
-    external:
-      name: docker-network