Migrate Getting Started Guide (Java)

AT:

• All Screenshots are up to date
• It works with 7.14.0
• Code Examples in the docs use 7.14.0 version
• Source Code in solution repository uses 7.14.0 Version
• Update the NOTICE file if necessary (bump the year if it's the first release of the year)

RESOURCES:

• Project repo: https://github.com/camunda/camunda-get-started-java
• Static docs repo (push your changes on the 7.14-release branch): https://github.com/camunda/camunda-docs-static/tree/7.14-release
• Adjustment guide