docs: fix duplicate sidebar order number

how-to/ customize-bmad.md and project-context.md had the same order
number

docs/how-to/project-context.md

@@ -2,7 +2,7 @@
 title: "Manage Project Context"
 description: Create and maintain project-context.md to guide AI agents
 sidebar:
-  order: 7
+  order: 8
 ---
 
 Use the `project-context.md` file to ensure AI agents follow your project's technical preferences and implementation rules throughout all workflows. To make sure this is always available, you can also add the line `Important project context and conventions are located in [path to project context]/project-context.md` to your tools context or always rules file (such as `AGENTS.md`)

docs/how-to/shard-large-documents.md

@@ -2,7 +2,7 @@
 title: "Document Sharding Guide"
 description: Split large markdown files into smaller organized files for better context management
 sidebar:
-  order: 8
+  order: 9
 ---
 
 Use the `bmad-shard-doc` tool if you need to split large markdown files into smaller, organized files for better context management.

docs/zh-cn/how-to/project-context.md

@@ -2,7 +2,7 @@
 title: "管理项目上下文"
 description: 创建并维护 project-context.md 以指导 AI 智能体
 sidebar:
-  order: 7
+  order: 8
 ---
 
 使用 `project-context.md` 文件确保 AI 智能体在所有工作流程中遵循项目的技术偏好和实现规则。

docs/zh-cn/how-to/shard-large-documents.md

@@ -2,7 +2,7 @@
 title: "文档分片指南"
 description: 将大型 Markdown 文件拆分为更小的组织化文件，以更好地管理上下文
 sidebar:
-  order: 8
+  order: 9
 ---
 
 如果需要将大型 Markdown 文件拆分为更小、组织良好的文件以更好地管理上下文，请使用 `shard-doc` 工具。