Downloads: Updates for v0.10.0

* Set filenames once in the download page

* Edit download page for new or updated files

* Add link to the source code, GitHub and torrent download

* Replace long sync instructions by short instructions to run a full node on the download page

Commit originated by Saïvann Carignan and updated by Dave Harding.

img/icons/mini_ico_magnet.svg

@@ -0,0 +1,77 @@
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