remove broken links

Author: shineyruan

content/posts/565-cuda-path-tracer/index.en.md

@@ -76,7 +76,7 @@ Finished Advanced Features:
 
 Ray tracing is a technique commonly used in rendering. Essentially it mimics the actual physical behavior of light: shoots a ray from every pixel in an image and calculates the final color of the ray by bouncing it off on every surface it hits in the world, until it reaches the light source. In practice a maximum number of depth (bouncing times) would be specified, so that we would not have to deal with infinitely bouncing rays.
 
-Ray tracing is one of the applications considered as "embarrassingly parallel", given the fact that each ray is completely independent of other rays. Hence, it is best to run on an GPU which is capable of providing hundreds of thousands of threads for parallel algorithms. This project aims at developing a CUDA-based application for customized ray tracing, and a detailed instruction can be found [here](INSTRUCTION.md).
+Ray tracing is one of the applications considered as "embarrassingly parallel", given the fact that each ray is completely independent of other rays. Hence, it is best to run on an GPU which is capable of providing hundreds of thousands of threads for parallel algorithms. This project aims at developing a CUDA-based application for customized ray tracing.
 
 #### BSDF: Bidirectional Scattering Distribution Functions
 

content/posts/565-vulkan-grass-rendering/index.en.md

@@ -61,8 +61,6 @@ This project implements physically-based grass rendering & culling with Vulkan c
 * 3 different culling tests: orientation culling, view-frustum culling, distance culling;
 * Tessellating Bezier curves into grass blades with GLSL tessellation shader
 
-A detailed instruction of this project can be found [here](INSTRUCTION.md).
-
 ### Vulkan
 
 [Vulkan](https://vulkan-tutorial.com/) is considered as the next-generation graphics API developed by [Khronos group](https://www.khronos.org/), in replacement for the old OpenGL. It is fast, high-performance, and cross-platform. However, the downside of this API is that it exposes all details of GPU hardware to users for possible customization, so that it generally takes a significantly large amount of code for users to set up the rendering pipeline than OpenGL.