Removes ConfigScreen

It was unused.

src/main/java/markil3/immersive_hud/ConfigScreen.java

@@ -1,36 +0,0 @@
-package markil3.immersive_hud;
-
-import com.mojang.blaze3d.matrix.MatrixStack;
-
-import net.minecraft.client.gui.screen.Screen;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TranslationTextComponent;
-
-public class ConfigScreen extends Screen
-{
-    /**
-     * Distance from top of the screen to this GUI's title
-     */
-    private static final int TITLE_HEIGHT = 8;
-
-    protected ConfigScreen()
-    {
-        super(new TranslationTextComponent("immersive_hud.configGui.title"));
-    }
-
-    @Override
-    public void render(MatrixStack matrixStack,
-                       int mouseX,
-                       int mouseY,
-                       float partialTicks)
-    {
-        this.renderBackground(matrixStack);
-        this.drawCenteredString(matrixStack,
-                this.font,
-                this.title.getString(),
-                this.width / 2,
-                TITLE_HEIGHT,
-                0xFFFFFF);
-        super.render(matrixStack, mouseX, mouseY, partialTicks);
-    }
-}