docs: fix outdated link

Author: ulivz

packages/docs/docs/miscellaneous/design-concepts.md

@@ -10,7 +10,7 @@ The design concepts of VuePress 1.x are mainly reflected in the following aspect
 2. Convention over configuration.
 3. Reasonable priority management.
 
-## Pluggable 
+## Pluggable
 
 VuePress 1.0 has been rewritten extensively, and the most important one is the introduction of the [Plugin API](../plugin/README.md). So what're the benefits of plugins?
 
@@ -78,7 +78,7 @@ module.exports = {
 
 ## Convention over configuration.
 
-VuePress 1.0 begin to introduce some conventions to reduce the user's excessive configuration pressure, the most intuitive manifestation of this is the conventions for the [document directory structure](../guide/directory-structure.md) and the [theme directory structure](../theme/README.md#directory-structure).
+VuePress 1.0 begin to introduce some conventions to reduce the user's excessive configuration pressure, the most intuitive manifestation of this is the conventions for the [document directory structure](../guide/directory-structure.md) and the [theme directory structure](../theme/writing-a-theme.md#directory-structure).
 
 In the future, we may combine community feedback to introduce more agreements. Let's wait and see.
 

packages/docs/docs/zh/miscellaneous/design-concepts.md

@@ -78,7 +78,7 @@ module.exports = {
 
 ## 约定大于配置
 
-VuePress 1.0 开始引入一些约定，以减少用户过多的配置压力。对于这一点，最直观的体现是对[文档目录结构](../guide/directory-structure.md)和[主题目录结构](../theme/README.md#directory-structure)的约定。
+VuePress 1.0 开始引入一些约定，以减少用户过多的配置压力。对于这一点，最直观的体现是对[文档目录结构](../guide/directory-structure.md)和[主题目录结构](../theme/writing-a-theme.md#目录结构)的约定。
 
 未来我们可能还会结合社区的反馈来引入更多的约定，让我们拭目以待。