Update fullstack_part3_reactonly.md

Create fullstack_part3_reactonly.md

clarify where the Jenkins credentials setting is found

Correcting commands to stop and remove docker containers

correcting location for .env.production

tidy up to full stack deploy lab part 3

jenkins and docker-compose lab

Removing random docker port for docker images lab

minor edit to instructions re. ports

Minor tweak to set port

adding bitbucket authentication to lab 4

Update module3_images.md fixing dockerfile

#1 updating entrypoint

#1 updating folder structure for project

lab 4 Github version update due to presence of dockerfile in repo