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assets/readme-rendering: Use dompurify as XSS filter

Antoine Lambert requested to merge generated-differential-D1412-source into generated-differential-D1412-target

XSS filtering has recently been added to swh-web (!89 (closed)) for the rendering of README files in markdown format.

But as @kalpitk noticed it, the rendering of images located in an origin source tree is now broken.

So instead of using showdown-xss-filter package, prefer to use the dompurify one which seems to have a good default white list for XSS filtering.

Related #1642 (closed)

Migrated from D1412 (view on Phabricator)

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