build(Dockerfile): set correct wasm-pack target and remove useless …

…copies

Dockerfile

@@ -8,7 +8,7 @@ RUN curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
 COPY . .
 
 WORKDIR /usr/build/harper-wasm
-RUN wasm-pack build --release
+RUN wasm-pack build --release --target web
 
 FROM node:slim AS node-build
 
@@ -32,10 +32,6 @@ RUN yarn install && yarn build
 FROM node:slim
 
 COPY --from=node-build /usr/build/packages/web/build /usr/build/packages/web/build
-COPY --from=node-build /usr/build/packages/web/package.json /usr/build/packages/web/package.json 
-COPY --from=node-build /usr/build/packages/package.json /usr/build/packages/package.json 
-COPY --from=node-build /usr/build/packages/yarn.lock /usr/build/yarn.lock
-COPY --from=node-build /usr/build/packages/node_modules /usr/build/node_modules
 
 WORKDIR /usr/build/packages/web