fix bad links in design.md. (#94)

relocate links: /img/RustyVault-arch.png to
/docs/static/img/RustyVault-arch.png

Author: movonow

docs/docs/design.md

@@ -8,7 +8,7 @@ As per: [RustyVault Requirements Document](./req.md). In this document we descri
 
 # Architecture Diagram
 
-![RustyVault Architecture](/img/RustyVault-arch.png)
+![RustyVault Architecture](/docs/static/img/RustyVault-arch.png)
 
 Detailed description:
 

docs/i18n/zh-CN/docusaurus-plugin-content-docs/current/design.md

@@ -9,7 +9,7 @@ title: 设计
 
 # 结构图
 
-![RustyVault Architecture](/img/RustyVault-arch.png)
+![RustyVault Architecture](/docs/static/img/RustyVault-arch.png)
 
 说明如下：
 

docs/i18n/zh-CN/docusaurus-plugin-content-docs/version-0.0.1/design.md

@@ -9,7 +9,7 @@ title: 设计
 
 # 结构图
 
-![RustyVault Architecture](/img/RustyVault-arch.png)
+![RustyVault Architecture](/docs/static/img/RustyVault-arch.png)
 
 说明如下：
 

docs/versioned_docs/version-0.0.1/design.md

@@ -8,7 +8,7 @@ As per: [RustyVault Requirements Document](./req.md). In this document we descri
 
 # Architecture Diagram
 
-![RustyVault Architecture](/img/RustyVault-arch.png)
+![RustyVault Architecture](/docs/static/img/RustyVault-arch.png)
 
 Detailed description: