Update README.md

I added some inline notes on using Fig - I'm not sure if the formatting really works correctly or if it should be it's own section etc.
Merge pull request #15 from mattreyuk/patch-1

Update README.md with some fig basics
Make a tools section
Update README.md
Update README.md
Add a more comprehensive warning.
Update warning.
Add line about installation
Add a note about docker image ids.
Update README.md
Add the docker in production link.
Add clarification on EXPOSE and port forwarding.
Update README.md
Add Lyst blog post.
Add "Run local registry" section.
Merge pull request #16 from PetrGlad/master

Add "Run local registry" section.
Merge pull request #2 from wsargent/master

sync too