DARKNET: Add improved challenge achievement for BN15 (#2479)

* DARKNET: Add improved challenge achievement for BN15

* DARKNET: Adjust heartbleed check location for achievement

* Fix wrong achievement data and update svg

* DARKNET: Fix styling of documentation link

* lint

---------

Co-authored-by: CatLover <152669316+catloversg@users.noreply.github.com>

assets/Steam/achievements/icons/darknet-depths.svg

@@ -0,0 +1,63 @@
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