Tidy up - Githubissues

[x] Remove specific osx version, this will always be changing
[x] Add command to improve $ gb command (https://stackoverflow.com/a/48370253)
[x] Fix gitter badge broken link (#43)
[x] Remove sass - don't use it, only use node-sass
[x] Add aws cli tool installation
[x] Remove script.sh and add install commands inline in README instead - to promote a better understanding of what is happening.

Fixes #38 Fixes #41 Fixes #42 Fixes #43

samhstn / my-config