ox-confluence.el: omit radio target links (that end up being dead links)

[Karl Voit]

Hi!

As stated on [1] I do have an issue with export to Confluence markup
via org-mode/contrib/lisp/ox-confluence.el and radio targets[2].

When I am using a snippet like:

| - <<foo bar>> :: this is the explanation to this weird term
| 
|   [...]
| 
|   Please respect the foo bar everyhere.

... it gets exported like that:

| - *foo bar* - this is the explanation to this weird term
| 
|   [...]
| 
|   Please respect the [foo bar|foo bar] everyhere.

These "[foo bar|foo bar]" snippets are then interpreted by
Confluence as links to the Confluence pages named "foo bar" which
usually don't exist.

I think it would be a good improvement to ignore radio links in the
ox-confluence output.

Thanks!


[1] 
https://www.reddit.com/r/emacs/comments/fk5z1b/how_to_remove_foo_barfoo_bar_links_via/
    I'm asking how to search/replace current expressions as a
    short-term workaround.

[2] https://orgmode.org/manual/Radio-Targets.html

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