feat(quoteforge[examples]): add image-block demo cards

Author: lordvins226

content/image-demos/align.json

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+{
+  "template": "quote",
+  "theme": "dark-teal",
+  "size": "twitter-square",
+  "blocks": [
+    { "type": "headline", "parts": [{ "text": "Alignment", "style": "bold" }] },
+    { "type": "image", "src": "./photo.svg", "width": "sm", "align": "left", "alt": "left" },
+    { "type": "image", "src": "./photo.svg", "width": "sm", "align": "center", "alt": "center" },
+    { "type": "image", "src": "./photo.svg", "width": "sm", "align": "right", "alt": "right" }
+  ]
+}

content/image-demos/card.json

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+{
+  "template": "quote",
+  "theme": "dark-teal",
+  "size": "instagram-port",
+  "blocks": [
+    { "type": "image", "src": "./photo.svg", "width": "full", "align": "center", "alt": "Sunset over the hills" },
+    { "type": "headline", "parts": [
+      { "text": "Ship ", "style": "normal" },
+      { "text": "small", "style": "accent" },
+      { "text": ", ship often.", "style": "normal" }
+    ] },
+    { "type": "text", "content": "An image block sits inline with the rest of the card flow." }
+  ]
+}

content/image-demos/photo.svg

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+{
+  "template": "quote",
+  "theme": "dark-teal",
+  "size": "twitter-square",
+  "blocks": [
+    { "type": "headline", "parts": [{ "text": "Widths", "style": "bold" }] },
+    { "type": "image", "src": "./photo.svg", "width": "sm", "align": "center", "alt": "small" },
+    { "type": "image", "src": "./photo.svg", "width": "md", "align": "center", "alt": "medium" },
+    { "type": "image", "src": "./photo.svg", "width": "lg", "align": "center", "alt": "large" },
+    { "type": "image", "src": "./photo.svg", "width": "full", "align": "center", "alt": "full" }
+  ]
+}