Backstage: Move "Getting Started" section from repo readme to backstage.io/docs/getting-started

[taras]

A new user reached out to me yesterday via Discord asking for help getting started with Backstage. I suggested that they read the docs. They said they did. I asked them what they were reading and they gave me a link to Getting Started. I can see why they were confused.

Expected Behavior

New users should start with the shortest path to understanding how to get started.

Current Behavior

They're taken to starting the project locally which might resemble the development workflow but not how Backstage is meant to be used.

Possible Solution

Getting Started should take users to Create an App page with some context or a landing page where they can choose their path: development or starting project.

Steps to Reproduce

1. Go to Getting Started
2. Try to follow those instructions to create a new project
3. much confuse

Context

How has this issue affected you?

I don't like seeing people be confused.

What are you trying to accomplish?

Make it easier for new people to try Backstage.

[johnson-jesse]

I agree. I went down this same path only to discover the easier npx @backstage/create-app Though I have yet to get GitHub auth to work with this second approach.

[Rugvip]

The proper getting started entrypoint is here: https://github.com/spotify/backstage#getting-started
With the move to backstage.io/docs from GitHub, that wasn't carried along.

Repurposing this as an issue to move that section of the docs to the docs site :grin:

[OrkoHunter]

@johnson-jesse If you follow the steps here, you should be able to set up GitHub auth smoothly. 🥳
Created #2415 based to make this experience better.