Add --fresh parameter to JBang readme

[koppor]

Refine docs to setup JBang

Steps to test

Run on your CLI :)

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• [/] I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[palukku]

We have JabKit but also JabLS not styled like JabKit. Maybe we should make this consistent also on the sections

[koppor]

My thinking:

Language Server --> "LS" in short.

I find the second letter lowe case strange at two letters. I know that "XML" should be written "Xml" in variables.

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But AI is on your side:

[koppor]

https://google.github.io/styleguide/javaguide.html#s5.3-camel-case