Move back to SWS 2 as v3 is in beta

Dockerfile

@@ -5,8 +5,8 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY . .
 RUN mkdocs build --clean
 
-FROM joseluisq/static-web-server:3
+FROM joseluisq/static-web-server:2
 COPY config.toml /config.toml
 COPY --from=builder /docs/site /public
-ENV SERVER_CONFIG_FILE=/config.toml
+ENV SWS_CONFIG_FILE=/config.toml
 EXPOSE 8080