Create a simpler Getting Started with demo data

[michel-tricot]

What

Create a simpler Getting Started with demo data
Create a local Json destination

How

Ensure a flawless experience when running and Airbyte for the first time
Also fix some weird documentation links

Recommended reading order

1. *.md
2. destination-local-json

[jrhizor]

This path should match what we're doing in local csv.

I'm fine with just putting it in a relative directory to the mount (and requiring no preceding slash) or doing it how we do it in local-csv where we require it to start with /local/). Either way is fine if it matches.

This is how it's defined in local-csv:

      "destination_path": {
        "description": "Path to the directory where csv files will be written. Must start with the local mount \"/local\". Any other directory appended on the end will be placed inside that local mount. For more information check out our <a href=\"https://docs.airbyte.io/integrations/destinations/local-csv\">docs</a>",
        "type": "string",
        "examples": ["/local"],
        "pattern": "(^\\/local\\/.*)|(^\\/local$)"
      }