docs: documenting and sampling sprues

samples/sprues/_builtin_sprues.rb

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+require 'squib'
+
+Squib::Deck.new(cards: 8) do
+  background color: :white
+  rect stroke_width: 5, stroke_dash: '7 7'
+  text str: %w(First Second Third Fourth Fifth Sixth Seventh Eighth),
+       font: 'Sans 96', align: :center, valign: :middle,
+       height: :deck, width: :deck
+
+  %w(
+    a4_euro_card.yml
+    a4_poker_card_8up.yml
+    a4_poker_card_9up.yml
+    a4_usa_card.yml
+  ).each do |builtin|
+    save_sheet sprue: builtin, prefix: "sprue_#{builtin}_", dir: '.'
+  end
+end

samples/sprues/sprue.yml

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+---
+sheet_width: 8.5in
+sheet_height: 11in
+card_width: 2.5in
+card_height: 3.5in
+cards:
+- x: 0.5in
+  y: 0.125in
+- x: 3.0in
+  y: 0.125in
+- x: 5.5in
+  y: 0.125in
+- x: 0.5in
+  y: 3.625in
+- x: 3.0in
+  y: 3.625in
+- x: 5.5in
+  y: 3.625in
+- x: 0.5in
+  y: 7.125in
+- x: 3.0in
+  y: 7.125in
+- x: 5.5in
+  y: 7.125in
+crop_line:
+  lines:
+  - type: :vertical
+    position: 0.5in
+  - type: :vertical
+    position: 3.0in
+  - type: :vertical
+    position: 5.5in
+  - type: :vertical
+    position: 8.0in
+  - type: :horizontal
+    position: 0.125in
+  - type: :horizontal
+    position: 3.625in
+  - type: :horizontal
+    position: 7.125in
+  - type: :horizontal
+    position: 10.625in