Cyclic note embedding

[kukimik]

Describe the bug
Embedding notes may create cycles:

some_note.md:

blah

![[other_note]]

blah

other_note.md:

aaa

![[some_note]]

bbb

Screenshots
The result (in live preview) looks like this:

Expected behavior
I think the cycle should be detected and the embedding should stop at this point, probably displaying some message in place of the non-embedded note.

Additional context
I was asked to open an issue in #24 (comment).

When this was first reported on 8 Nov 2021, I couldn't open any of the notes in browser (the page didn't load at all, it looked like it was waiting for some infinite loop to finish). Now I can do it. I don't know whether it's the result of some change in emanote itself, or me using another computer.