- Fixed API reference title
- Removed asp.net + EF quickstart from top.

Fixed link for EF + Razor Pages tutorial

Fixed "Saving Basic" link.

Robert Lyon recommended some edits.  I made the following changes:
Get Started cards
•	Changed choose a version at the top to an overview type.  It was a bit confusing laving two getting started topics at the top.
You might be able to shorten some of the text
•	Getting Started with Entity Framework Core --> Entity Framework Core (since we have Get Started title and icon with it)
•	Course - Persist and retrieve relational data with Entity Framework Core --> Persist and retrieve relational data with Entity Framework Core
•	Choose a version of EF that is right for you --> Choose a version that is right for you
•	Entity Framework API reference browser --> API reference browser
•	Previous Entity Framework Versions --> Previous versions
Adjusted capping
•	Create a model
•	Save data
•	Supported databases
•	Command-line reference