Obsidian-like internal links support in markdown

[MayneX]

Is your feature request related to a problem? Please describe.
Usually my notes contain many internal links between each other, that are not supported by Nextcloud notes. It makes almost impossible using of this tool for many my friends and me.

Describe the solution you'd like

1. Links in double brackets should be linkable (e.g. [[internal link]])
2. If document is not found after a click, the new document has to be created
3. Internal links should support different use of links for languages with many "cases"

Describe alternatives you've considered
Sorry, I can't see usable alternative.

Additional context
Example of using internal links in Obsidian using different case for display

[korelstar]

Duplicate of #616