Warn the user to update to Java 17 if using Java 8

The launcher should detect if it is running on Java 8, and then warn the user to update to 64-bit Java 17 and JavaFX if running on a 64-bit system, or 32-bit Java 17 and JavaFX if running on a 32-bit system. The warning should link to the [Getting Started](https://chunky-dev.github.io/docs/getting_started/) page on the Chunky manual.

Start at the launcher entry point and trace how it determines the running Java version and system bitness. Done means that Java 8 users receive a warning naming the appropriate 32-bit or 64-bit Java 17 and JavaFX update, with a link to the Getting Started page.

Written by the indexing model from the issue text.