read-only link sharing of .md should not allow changing links from text to link-preview mode

To Reproduce
Steps to reproduce the behavior:

create a .md file with a link like example
share the file externally via link, but with read-only permission
access the link from different browser/computer
click the three dots to the left of the link, change it from "text" to "preview"
go back to logged-in user and refresh: the preview mode of the link was changed

Expected behavior
in read-only mode, nothing in the document should be allowed to change, also not the way links are displayed

Server details:

let me know if you need more details

fix(PreviewOptions): Move three-dot menu into preview box or link bubble

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