NetBeans Editor Component Palette Module Tutorial missing source code

### Apache NetBeans version

Apache NetBeans 14

### What happened

Source code not available for tutorial.

* [NetBeans Editor Component Palette Module Tutorial](https://netbeans.apache.org/tutorials/nbm-palette-api2.html)
* Corresponding [completed tutorial source code](http://web.archive.org/web/20170409072842/http://java.net/projects/nb-api-samples/show/versions/8.0/tutorials/palette) is a broken link

### How to reproduce

Go to web page, test link

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Windows 10

### JDK

OpenJDK 18.0.2

### Apache NetBeans packaging

Apache NetBeans binary zip

### Anything else

Always

### Are you willing to submit a pull request?

No

### Code of Conduct

Yes

Open the NetBeans Editor Component Palette Module Tutorial and verify the unavailable source-code link, then inspect the referenced archived location. Done means the tutorial provides a working way to obtain the corresponding completed source code; the issue names no repository file or test to run.

Written by the indexing model from the issue text.