fix: prod build failure caused by legacy-peer-deps when prune

[petruki]

This pull request introduces improvements to the build process, updates dependencies, and refactors how the Markdown module is provided in the Angular documentation module. The most important changes are grouped below:

Build process improvements:

• Updated the build steps in .github/workflows/master.yml to include a production build (npm run build:prod) and to prune development dependencies with legacy peer dependency support (npm prune --omit=dev --legacy-peer-deps).
• Modified the Dockerfile to use npm prune --omit=dev --legacy-peer-deps for consistency with the workflow, ensuring compatibility with legacy peer dependencies during the Docker build.

Dependency updates:

• Upgraded the base Nginx image in the Dockerfile from nginx:1.31.3-alpine-slim to nginx:1.31.4-alpine-slim for security and stability improvements.

Angular module refactoring:

• Refactored DocumentationModuleModule in documentation.module.ts to use the new provideMarkdown API for providing the Markdown module, replacing the previous MarkdownModule.forRoot and MarkdownModule.forChild usage.