refactor(editor): unify directories naming (#11516)

**Directory Structure Changes**

- Renamed multiple block-related directories by removing the "block-" prefix:
  - `block-attachment` → `attachment`
  - `block-bookmark` → `bookmark`
  - `block-callout` → `callout`
  - `block-code` → `code`
  - `block-data-view` → `data-view`
  - `block-database` → `database`
  - `block-divider` → `divider`
  - `block-edgeless-text` → `edgeless-text`
  - `block-embed` → `embed`

blocksuite/affine/blocks/divider/src/adapters/markdown.ts

@@ -0,0 +1,50 @@
+import { DividerBlockSchema } from '@blocksuite/affine-model';
+import {
+  BlockMarkdownAdapterExtension,
+  type BlockMarkdownAdapterMatcher,
+  type MarkdownAST,
+} from '@blocksuite/affine-shared/adapters';
+import { nanoid } from '@blocksuite/store';
+import type { ThematicBreak } from 'mdast';
+
+const isDividerNode = (node: MarkdownAST): node is ThematicBreak =>
+  node.type === 'thematicBreak';
+
+export const dividerBlockMarkdownAdapterMatcher: BlockMarkdownAdapterMatcher = {
+  flavour: DividerBlockSchema.model.flavour,
+  toMatch: o => isDividerNode(o.node),
+  fromMatch: o => o.node.flavour === DividerBlockSchema.model.flavour,
+  toBlockSnapshot: {
+    enter: (_, context) => {
+      const { walkerContext } = context;
+      walkerContext
+        .openNode(
+          {
+            type: 'block',
+            id: nanoid(),
+            flavour: 'affine:divider',
+            props: {},
+            children: [],
+          },
+          'children'
+        )
+        .closeNode();
+    },
+  },
+  fromBlockSnapshot: {
+    enter: (_, context) => {
+      const { walkerContext } = context;
+      walkerContext
+        .openNode(
+          {
+            type: 'thematicBreak',
+          },
+          'children'
+        )
+        .closeNode();
+    },
+  },
+};
+
+export const DividerBlockMarkdownAdapterExtension =
+  BlockMarkdownAdapterExtension(dividerBlockMarkdownAdapterMatcher);