Add redirects from swh-dataset to swh-export

To follow the package rename

Jenkins job DDOC/builds #916 failed in 21 min.
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added 5 commits

• 44eba68d...54a4fd76 - 4 commits from branch master
• 9b4dd969 - Add redirects from swh-dataset to swh-export

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Jenkins job DDOC/builds #929 succeeded in 16 min.
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merged