Remove our vsix files from theia-docker-image

... just as a experiment to see if it works better with them removed.

concourse/theia-docker-image/Dockerfile

@@ -23,10 +23,10 @@ RUN yarn --cache-folder ./ycache && rm -rf ./ycache && \
     NODE_OPTIONS="--max_old_space_size=8192" yarn theia build ; \
     yarn theia download:plugins
 
-ADD plugins /theia-app/plugins
-RUN rm /theia-app/plugins/README.txt 
+#ADD plugins /theia-app/plugins
+#RUN rm /theia-app/plugins/README.txt 
 
 ENV SHELL=/bin/bash \
     THEIA_DEFAULT_PLUGINS=local-dir:/theia-app/plugins
-ENTRYPOINT [ "yarn",  "theia", "start", "--hostname=0.0.0.0", "--plugins=local-dir:/theia-app/plugins/", "/home/project" ]
+ENTRYPOINT [ "yarn",  "theia", "start", "--hostname=0.0.0.0", "/home/project" ]
 EXPOSE 3000