samples: reorganize for better sanity

Converted to a more consistent organization of each folder for groups of samples

Contributes to #118

samples/proofs/_tgc_proofs.rb

@@ -0,0 +1,16 @@
+require 'squib'
+
+# This sample uses a proof overlay from TheGameCrafter.com to check bleed
+Squib::Deck.new(width: 825, height: 1125, cards: 1) do
+  background color: :white
+  rect x: 38, y: 38, width: 750, height: 1050, x_radius: 38, y_radius: 38
+  rect x: 75, y: 75, width: 128, height: 128, x_radius: 25, y_radius: 25
+
+  text str: 'Mastermind', x: 220, y: 78, font: 'Arial 54'
+  text str: 3, x: 75, y: 85, width: 128, font: 'Arial 72', align: :center
+
+  # TGC proof overlay (using alpha-transparency)
+  png file: 'pokercard.png', x:0, y:0, alpha: 0.5
+
+  save_png prefix: 'tgc_sample_'
+end