Move `using-northstar/gamemodes.md` to the dedicated `using-northstar` directory (#177)

* Move gamemodes.md to discrete using-northstar directory and update link

* Update SUMMARY.md

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+# Gamemodes
+
+Northstar comes included with some community made gamemodes.
+
+{% hint style="info" %}
+If you are looking for every available gamemode and its corresponding string check [hosting/gamemodes](../hosting-a-server-with-northstar/dedicated-server/README.md#gamemodes)
+{% endhint %}
+
+## Gun Game
+
+Get a kill with each gun to win.
+
+## Titan Tag
+
+Earn points while in your titan. Destroy a titan to get your own.
+
+## Infection
+
+Survivors are infected when killed.
+
+## Amped Killrace
+
+Get kills to increase the length of your killrace. Collect the flag to start it. Set the record to win.
+
+## Fastball
+
+Hack control panels to win rounds and respawn your teammates.
+
+## Competitive CTF
+
+CTF with custom settings for Comp games.
+
+## Frontier War
+
+Kill enemies to earn your titan, and use it to destroy the enemies Harvester.
+
+# Riffs
+
+Northstar also comes with several gameplay modifiers called riffs that can be toggled on and off by server hosts, or used in a private match.
+
+## Deadly Ground
+
+Creates a layer of electric smoke on the lowest parts of the map (does not cover the entire map)
+
+## Great Bamboozle
+
+Everyone's kit is changed to Holo Pilot.
+
+## Attack on Titanfall
+
+Everyone's kit is changed to Grapple, and Grapple gains one extra use.
+
+## Otherside
+
+Everyone's kit is changed to Phase Shift.
+
+## Spicy
+
+Replaces all ordnance/grenades with ticks.
+
+## Tactikill
+
+Killing an enemy refreshes your tactical/pilot kit.
+
+## Amped Tacticals
+Every tactical/pilot kit gets an additional use to it
+
+## Rocket Arena
+Weapons are replaced with an EPG that does 40 damage, a RE-45 that does reduced damage, and a Charge Rifle
+
+## Armed & Dangerous
+
+Weapons are replaced with a Kraber, Mastiff, and Charge Rifle
+
+## Iron Rules
+Disables disembarking and ejecting from titans.
+
+## First person embarks/executions
+Enables first person embark animations for titans and first person executions for both pilots and titans.
+
+## Instagib
+Every kill gibs