docs(readme): fix github markdown callout (#1945)

Signed-off-by: Keming <[email protected]>

README.md

@@ -248,7 +248,7 @@ envd-quick-start        http://localhost:42779   envd-quick-start.envd   /home/g
 
 ## Difference between v0 and v1
 
-> **Note**
+> [!NOTE]
 > To use the `v1` config file, add `# syntax=v1` to the first line of your `build.envd` file.
 
 | Features | v0 | v1 |
@@ -261,11 +261,11 @@ envd-quick-start        http://localhost:42779   envd-quick-start.envd   /home/g
 | support installing multiple languages | ⚠️ | ✅ |
 | support `moby` builder | ❌ | ✅ <sup>[(a)](#v1-moby)</sup> |
 
-> **Note**
+> [!NOTE]
 > <a name="v1-moby">(a)</a> To use the `moby` builder, you will need to create a new context with `envd context create --name moby-test --builder moby-worker --use`.
 > For more information about the `moby` builder, check the [issue-1693](https://github.com/tensorchord/envd/issues/1693).
 
-> **Important**
+> [!IMPORTANT]
 > For more details, check the [upgrade to v1](https://envd.tensorchord.ai/guide/v1.html) doc.
 
 ## More on documentation 📝