Mr. Drew's Assignment Creator — Docker share build

Self-contained Dockerized build for end users. Run via docker compose;
see README.md for setup. Source-only, no sample data or build artifacts.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,11 @@
+node_modules
+.next
+data
+docker
+.git
+.gitignore
+.DS_Store
+*.png
+*.pdf
+*.log
+README.md