In Header.jsx, the Order history item was added in the user menu using the ORDER_HISTORY_URL environment variable as href.
Environment Variables section in README.rst updated with the description of ORDER_HISTORY_URL.
* docs: fleshing out the readme
Making it consistent with frontend-component-footer and much more detailed.
* fix: Removing unused variable, siteName
Also fixing logout URL in development. (We fixed this in a number of other repositories already, but somehow this one snuck through)
