Containerfile: fix font download path and remove submodule dependency

- Font installed at the correct settings.FONT_PATH location
  (os.path.dirname(settings.FONT_PATH)), not relative to marker package dir
- Remove marker/ submodule reference; marker-pdf now installed from GitHub
- Updated header comment and default ENV values for public-readiness
- Add comment with alternative local-build pip command

Containerfile

@@ -30,12 +30,11 @@ RUN pip install --no-cache-dir --break-system-packages \
     pip install --no-cache-dir --break-system-packages flask gunicorn
 
 # ---- font: download GoNotoCurrent-Regular.ttf at build time ----
-# Find the marker package dir inside the installed package
-RUN MARKER_DIR=$(python3 -c "import marker; print(marker.__path__[0])") && \
-    mkdir -p "$MARKER_DIR/static/fonts" && \
-    curl -sL -o "$MARKER_DIR/static/fonts/GoNotoCurrent-Regular.ttf" \
+RUN FONT_DIR=$(python3 -c "from marker.settings import settings; import os; print(os.path.dirname(settings.FONT_PATH))") && \
+    mkdir -p "$FONT_DIR" && \
+    curl -sL -o "$FONT_DIR/GoNotoCurrent-Regular.ttf" \
     "https://models.datalab.to/artifacts/GoNotoCurrent-Regular.ttf" && \
-    chown marker:marker "$MARKER_DIR/static/fonts/GoNotoCurrent-Regular.ttf"
+    chown -R marker:marker "$FONT_DIR"
 
 # ---- final image ----
 COPY app.py           /app/