Added examples and documentation for the published docker image

docker/examples/simple/Dockerfile

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+# Start from the official compiled container
+FROM ghcr.io/pewu/topola-viewer:latest
+
+# Copy the unzipped GEDCOM file directly into public folder
+COPY family.ged /app/public/family.ged
+
+# Configure server to pre-load this raw GEDCOM file
+ENV STATIC_URL=family.ged

docker/examples/simple/README.md

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+# Standalone GEDCOM Container Example
+
+This example builds a self-contained image that hosts a single `.ged` file directly (no photos).
+
+## Instructions
+
+1. Put your GEDCOM file in this directory and name it `family.ged`.
+2. Build your custom container:
+   ```bash
+   docker build -t my-simple-tree .
+   ```
+3. Run your container:
+   ```bash
+   docker run -d -p 8080:8080 my-simple-tree
+   ```

docker/examples/simple/family.ged

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+0 HEAD
+1 SOUR GENJ
+2 VERS 1.0
+1 GEDC
+2 VERS 5.5.1
+2 FORM Lineage-Linked
+1 CHAR UTF-8
+0 @I1@ INDI
+1 NAME John /Doe/
+1 SEX M
+1 FAMS @F1@
+1 FAMC @F2@
+0 @I2@ INDI
+1 NAME Jane /Smith/
+1 SEX F
+1 FAMS @F1@
+0 @F1@ FAM
+1 HUSB @I1@
+1 WIFE @I2@
+1 CHIL @I3@
+1 CHIL @I4@
+0 @I3@ INDI
+1 NAME Bobby /Doe/
+1 SEX M
+1 FAMC @F1@
+0 @I4@ INDI
+1 NAME Sally /Doe/
+1 SEX F
+1 FAMC @F1@
+0 @I5@ INDI
+1 NAME Grandpa /Doe/
+1 SEX M
+1 FAMS @F2@
+0 @F2@ FAM
+1 HUSB @I5@
+1 CHIL @I1@
+0 TRLR