Making slight modifications for better consistency across the doc
Removing quotes from readme. Quotes in cases like docker-compose are provided as literals and invalidate the config. Quotes are also only necessary in YaML if it will create type-aware objects such as integers or arrays.
Removing quotes from bash commands as they're not really required unless the value has spaces.
Removing single quotes from image name, not necessary.
Making slight modifications for better consistency across the doc