feat(content): validate versioned guide blocks

lib/blocks/index.ts

@@ -0,0 +1,24 @@
+export {
+  blockRegistry,
+  isKnownBlockType,
+  resolveBlock,
+  validatePageBlocks,
+} from "./registry";
+export type {
+  BlockResolution,
+  InvalidBlock,
+  ReadyBlock,
+  SerializedBlock,
+  UnsupportedBlock,
+  ValidBlock,
+} from "./registry";
+export {
+  blockSchemas,
+  comparisonChartSchema,
+  responsiveLayoutSchema,
+} from "./schemas";
+export type {
+  ComparisonChartConfig,
+  KnownBlockType,
+  ResponsiveLayout,
+} from "./schemas";