remove unused, unnecessary panel with no concave

rename bottom panels now that concave is normal

src/bottom-panel-solo.scad

@@ -0,0 +1,28 @@
+/* Copyright Brian Stephan 2023
+ *
+ * This file is part of the Buildable Stick System.
+ *
+ * The Buildable Stick System is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * The Buildable Stick System is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * the Buildable Stick System. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+include <components.scad>
+
+module bottom_panel_solo() {
+	difference() {
+		bottom_plate_with_overhang();
+		translate([0, 0, top_plate_z/2]) cube([top_plate_x*5/6, top_plate_y*5/6, top_plate_z], center=true);
+	}
+}
+
+bottom_panel_solo();