highlight: only pygmentize for HTML mimetypes
For non-html mimetypes it doesn't make much sense. This also fixes the
issue that highlight unconditionally adds a <link/> tag for its CSS to
the template's header (which is pointless in text/plain output).
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e7fe8eb3e180+0d24b7662d3e+ tip
<<<<<<< local
something else
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something
>>>>>>> other
M a
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