[Learning XQuery and eXist-db] The list of IDEs needs an update

[line-o]

Describe the problem

https://exist-db.org/exist/apps/doc/learning-xquery#ide lists only oXygen as a well integrated IDE to work with exist

Needs mentions of

• intellij IDEA with https://plugins.jetbrains.com/plugin/8612-xquery-and-xslt
• vscode with https://marketplace.visualstudio.com/items?itemName=eXist-db.existdb-vscode

Please provide the following

• exist-db version: 6.2.0
• documentation version: 6.1.6