Un-hardcode block documentation

Opens it up for all our custom blocks to be able to provide information.

Need a texture from @Yulife.

src/main/resources/assets/bloodmagic/blockstates/item/ItemSanguineBook.json

@@ -0,0 +1,16 @@
+{
+  "forge_marker": 1,
+  "defaults": {
+    "model": "builtin/generated",
+    "transform": "forge:default-item"
+  },
+  "variants": {
+    "type": {
+      "normal": {
+        "textures": {
+          "layer0": "bloodmagic:items/SanguineBook"
+        }
+      }
+    }
+  }
+}