docs: add cicd plan, remove changelist (#773)

* add new plan

* Update mintlify/docs.json

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Tianzhou <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: 3 people

mintlify/change-database/plan.mdx

@@ -0,0 +1,43 @@
+---
+title: Plan
+---
+
+A **Plan** is the core component of Bytebase’s CI/CD pipeline. It defines a series of schema or data changes to be applied to one or more databases.
+
+### 1. Create a New Plan
+In your project, go to **CI/CD** > **Plans** in the left menu and click **New Plan**.
+
+![new-plan](/content/docs/change-database/plan/bb-new-plan.webp)
+
+### 2. Choose the Change Type
+Select either **Schema Migration (DDL)** or **Data Migration (DML)**. After adding the first change, you can continue to add more.
+
+![plan-change-type](/content/docs/change-database/plan/bb-plan-change-type.webp)
+
+### 3. Select Target Databases
+Choose one or more databases where the changes will be applied. Click **Confirm** to proceed.
+
+![plan-targets](/content/docs/change-database/plan/bb-plan-targets.webp)
+
+### 4. Add Changes
+Fill in the SQL statement. You can add multiple changes to the same plan. Once done, click **Create**.
+
+![plan-add-change](/content/docs/change-database/plan/bb-plan-add-change.webp)
+![plan-2-change](/content/docs/change-database/plan/bb-plan-2-change.webp)
+
+### 5. Submit for Review
+The plan starts in a `draft` state. Click **Ready for Review** to submit it for approval.
+
+![plan-draft](/content/docs/change-database/plan/bb-plan-draft.webp)
+
+### 6. Approve and Roll Out
+Once approved, go to the **Rollout** section to begin deployment.
+
+![plan-approval](/content/docs/change-database/plan/bb-plan-approval.webp)
+![plan-ready-rollout](/content/docs/change-database/plan/bb-plan-ready-rollout.webp)
+
+### 7. Deploy to Environments
+First, deploy to the `Test` environment. If successful, proceed to deploy to `Prod`.
+
+![plan-rollout-test](/content/docs/change-database/plan/bb-plan-rollout-test.webp)  
+![plan-rollout-prod](/content/docs/change-database/plan/bb-plan-rollout-prod.webp)

mintlify/change-database/schema-editor.mdx

@@ -9,7 +9,11 @@ feature_name: SCHEMA_EDITOR
 
 ## Schema Editor Entry
 
-Select a certain project and go to **Database** -> **Databases** in the left-side menu. Select _one_ of the databases and click **Edit Schema**.
+While creating a new plan within a project, go to **CI/CD** > **Plans** in the left menu, and click **New Plan**. Choose `Schema Migration` as the plan type and click **Next**. Select _one_ database and click **Next**. You will see the Schema Editor.
+
+![new-plan-schema-editor](/content/docs/change-database/schema-editor/bb-new-plan-schema-editor.webp)
+
+Alternatively, you can go to **Database** > **Databases** in the left menu, select _one_ database and click **Edit Schema**.
 
 ![](/content/docs/change-database/schema-editor/schema-editor-entry.webp)