Redirect alpha and hardened channels to dist.tpo rather than aus1.tpo
A few months ago we added the following redirects: 1. https://www.torproject.org/dist/torbrowser/update_2/alpha/ --> https://aus1.torproject.org/torbrowser/update_2/alpha/ 2. https://www.torproject.org/dist/torbrowser/update_2/hardened/ --> https://aus1.torproject.org/torbrowser/update_2/hardened/ 3. https://dist.torproject.org/torbrowser/update_2/alpha/ ---> https://aus1.torproject.org/torbrowser/update_2/alpha/ 4. https://dist.torproject.org/torbrowser/update_2/hardened/ ---> https://aus1.torproject.org/torbrowser/update_2/hardened/ Because there is no pinning on aus1.tpo yet, we want to move the `alpha` and `hardened` channels URLs back to dist.tpo (like the `release` channel). The redirects 1. and 2. should be modified to point to https://dist.torproject.org/torbrowser/update_2/alpha/ and https://dist.torproject.org/torbrowser/update_2/hardened/. The redirects 3. and 4. should be removed. Currently the xml files are deployed in both locations, so that it continues to work after the redirects are updated: - /srv/dist-master.torproject.org/htdocs/torbrowser/update_2/alpha - /srv/aus1-master.torproject.org/htdocs/torbrowser/update_2/alpha
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