Removed Catwalk. Replaced with FootstepModifierComponent (#2496)

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/GameObjects/Components/CatwalkComponent.cs

@@ -1,13 +0,0 @@
-using Robust.Shared.GameObjects;
-
-namespace Content.Server.GameObjects.Components
-{
-    /// <summary>
-    ///     Literally just a marker component for footsteps for now.
-    /// </summary>
-    [RegisterComponent]
-    public sealed class CatwalkComponent : Component
-    {
-        public override string Name => "Catwalk";
-    }
-}