AVRO-3559: Fix links to "Getting started ..." on the home page

[martin-g]

Jira

• https://issues.apache.org/jira/browse/AVRO-3559

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference Jira issues in their subject lines. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain Javadoc that explain what it does

[opwvhk]

Thank you for picking this up already @martin-g !

(I was a bit tired when I added the story, so I thought I'd do this today. so you clearly beat me to it 😄 )