Update build page, using JDK 14

[Zemogiter]

Solves the #2115 so .deb package is working.
As for the optional step, I was unable to find a working link so I've removed it for now.

[madoar]

@Zemogiter essentially you are saying that you need Java 13 to successfully run the build tool?

[madoar]

I have two issues against this an update to Java 13:

• Java 13 is not easily available on all distributions. Especially older ones may require custom package repositories
• Java 13 is not a LTS version. This means that we would need to update the guide to Java 14 in around 2 months.

On another note it may be worth thinking about using Java 14 after it is released because it is planned to come with the new packaging tool, see also here.

[Zemogiter]

@madoar yes I need java 13 to run the build tool and according to this:
https://en.wikipedia.org/wiki/Java_version_history
Java 14 won't be LTS either to it's kind of a moot point and 2 months isn't a short time.

[madoar]

... according to this:
https://en.wikipedia.org/wiki/Java_version_history
Java 14 won't be LTS either to it's kind of a moot point and 2 months isn't a short time.

Yes, you are right about that. I mainly wanted to say that Java 14 comes brings additional benefits to Phoenicis (i.e. the final release of the packaging tool), which could be worth it to think about using Java 14 at least for building the installer packages.

[plata]

@qparis should take a look at the packaging with Java 14.

[plata]

We should update this to Java 17.