docs: comment out the live example config in the README

The configuration block is presented as something to copy, and every
optional key in it is commented out with ';' except two. Copying the
block therefore activated whatever those two happened to say: three
extra mimetypes nobody chose, and a sync command pointing at a path
that does not exist on the reader's machine.

Neither was harmful (extra_mimetypes only appends to the built-in list,
and an unresolvable sync command just disables the button with a
tooltip), but both are config acquired by accident rather than by
decision.

Comment them out verbatim. The extra_mimetypes line in particular has
to stay legible rather than be deleted: it is the only worked example
of the '|' and ',' separators, and the reason those two characters
differ is subtle enough that the prose above it needs the illustration.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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