[Angular - NgRx - SCSS] Single repo README issues

[lindakatcodes]

A few things are not working properly when on a repository page, mostly related to the readme files and tree navigation.

AC:

• [ ] The root README should only show on the root page - if navigating into other folders, the root README should not show on those pages
• [ ] If a deeper folder has it's own README file, that file should show
• [ ] Clicking the Readme link in the about section of the page should scroll down to the readme section