Add Steam Controller Settings and Slipstream page

docs/v5/miscellaneous/steam-controller-settings.md

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+# Steam Controller Settings
+
+Steam offers various controller settings such as custom deadzones.
+By registering Rocket League as a non-Steam game on Steam these features become available for Epic Games installations of Rocket League too.
+Unfortunately, RLBot cannot launch non-Steam games automatically.
+The workaround is to launch Rocket League in RLBot mode manually.
+By using [Slipstream](https://github.com/jun-eau/Slipstream) you will be logged in to your Epic account so you get your items/settings.
+
+Steps:
+
+- Download and add [Slipstream](https://github.com/jun-eau/Slipstream) as a non-Steam game on Steam.
+- Right click, open Properties, and add the launch options: `-rlbot RLBot_ControllerURL=127.0.0.1:23233 RLBot_PacketSendRate=240 -nomovie -noeac`
+- Launch it to open Rocket League in NoEAC+RLBot mode.
+- Use RLBot as normal.
+
+You can have two instances of Slipstream on Steam so you don't have to edit the launch options each time you want to use RLBot.