allow styles on any element when sanitizing html - fixes #538

What does this MR do?

just allowing things like <p style="whatever…">…</p> in instance description and server rules.

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Closes #538 (closed)

added bug label

requested review from @CenTdemeern1, @fEmber, @julia, @tess, and @Marie

Is this used for any remote HTML, or only local?

resolved all threads

approved this merge request

approved this merge request

mentioned in commit 36b7572b

merged